How to insert a jsonNode as a value to another jsonNode in java

I have a csv file,
Employee: Salutation,LegalEntityId,FirstName,MiddleName,LastName,DisplayName,WorkPhoneCountryCode,WorkPhoneAreaCode,WorkPhoneNumber,WorkMobilePhoneCountryCode,WorkMobilePhoneAreaCode,WorkMobilePhoneNumber,HomeFaxCountryCode,HomeFaxAreaCode,HomeFaxNumber,HomePhoneCountryCode,HomePhoneAreaCode,HomePhoneNumber,NameSuffix,NationalIdExpirationDate,WorkEmail,AddressLine1,AddressLine2,AddressLine3,City,Region,Region2,Country,PostalCode,CitizenshipLegislationCode,CitizenshipStatus,PassportNumber,PassportIssueDate,Religion,LicenseNumber,DateOfBirth,Ethnicity,Gender,MaritalStatus,NationalIdCountry,NationalId,NationalIdType,UserName,AssignmentName,BusinessUnitId,JobId,WorkerCategory,AssignmentCategory,WorkingAtHome,WorkingAsManager,SalaryCode,WorkingHours,Frequency,SalaryAmount,SalaryBasisId,ActionCode,ActionReasonCode,AssignmentStatus,ManagerType
MS.,3.00E+14,Ciran,Myle,Machell,Ciran Myle Machell,1,1,781-993-0000,1,1,581-993-0000,1,1,1111664,1,1,122933334,Jr.,1027428,[email protected],Oracle Corporation,500 Oracle Parkway,null,San Francisco,San Francisco,CA,US,94123,US,A,11553397,37621,CHRISTIAN,9955501858,33033,8,F,S,US,254-44-3022,SSN,MachellCira,Analyst,3.00E+14,3.00E+14,WC,FR,N,N,H,12,D,100000,3.00E+14,HIRE,NEWHIRE,ACTIVE,LINE_MANAGER

Please help me modify the code get the output of the form,

{
  "Salutation" : "MS.",
  "LegalEntityId" : "300100003448002",
  "FirstName": "Miranda",
  "MiddleName": "Kyle",
  "LastName": "Rachell",
  "DisplayName" : "Miranda Kyle Rachell",
  "WorkPhoneCountryCode" : "1",
  "WorkPhoneAreaCode" : "1",
  "WorkPhoneNumber" : "781-993-0000",
  "WorkMobilePhoneCountryCode" : "1",
  "WorkMobilePhoneAreaCode" : "1",
  "WorkMobilePhoneNumber" : "581-993-0000",
  "HomeFaxCountryCode":"1",
  "HomeFaxAreaCode":"1",
  "HomeFaxNumber":"1111663",
  "HomePhoneCountryCode":"1",
  "HomePhoneAreaCode":"1",
  "HomePhoneNumber":"122993333",
  "NameSuffix":"Jr.",
  "NationalIdExpirationDate" : "4712-12-31",    
  "WorkEmail" : "[email protected]",
  "AddressLine1" : "Oracle Corporation",
  "AddressLine2" : "500 Oracle Parkway",
  "AddressLine3" : null,
  "City" : "San Francisco",
  "Region" : "California",
  "Region2" : null,
  "Country" : "US",
  "PostalCode": "94065",
  "CitizenshipLegislationCode" : "US",
  "PassportNumber" : "11557799",
  "PassportIssueDate" : "2002-12-31",
  "Religion" : "CHRISTIAN",
  "LicenseNumber" : "9955500858",
  "DateOfBirth": "1990-09-09",
  "Ethnicity": "8",
  "Gender" : "F",
  "MaritalStatus" : "S",
  "NationalIdCountry": "US",
  "NationalId": "554-44-3025",
  "NationalIdType": "SSN",
  "UserName":"rachell",
  **"assignments" :  **
    [
    {
     "AssignmentName": "Rachell_Assignment_1",
     "BusinessUnitId" : "202",
     "JobId" : "18",
     "WorkerCategory" : "WC",
     "AssignmentCategory" : "FR",
     "WorkingAtHome" : "N",
     "WorkingAsManager" : "N",
     "SalaryCode" : "H",
     "WorkingHours" : "12",
     "Frequency" : "D",
     "SalaryAmount" : "100000",
     "SalaryBasisId" : "100010024999994",
     "ManagerAssignmentId" : "389",
     "ManagerId" : "383",
     "ActionCode" : "HIRE", 
     "ActionReasonCode" : "NEWHIRE",
     "AssignmentStatus" : "ACTIVE",
     "WorkTaxAddressId" : "300100011952957",
     "ManagerType" : "LINE_MANAGER" 
     }
     ]
}

The data given is a demo data. I am not that into Java.

The code is given below

package post;

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.io.BufferedInputStream;
import org.apache.commons.io.IOUtils;
import java.io.InputStream;
//import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ObjectNode;

public class PostEmployee {
    public static void main(String[] args) throws IOException {
        String file1Path = "Employee.csv";
        String username = "hcm_imp9";
        String password = "pwd";
        
        List<JsonNode> jsonArray = new ArrayList<>();
        BufferedReader br = new BufferedReader(new FileReader(file1Path));
        String line;
        JsonNode jsonObject;
        String[] headers = null;
        while ((line = br.readLine()) != null) {
            String[] values = line.split(",");
            if (headers == null) {
                headers = values;
            } else {
                ObjectMapper objectMapper = new ObjectMapper();
                jsonObject = objectMapper.convertValue(headersZip(values, headers), JsonNode.class);
                jsonArray.add(jsonObject);
            }
        }
            br.close();
       
        String jsonString = jsonArray.toString();
        jsonString = jsonString.replace(":", ": ");
        System.out.println(jsonString);
        }
private static JsonNode headersZip(String[] values, String[] headers) {
    if (values == null || headers == null || values.length != headers.length) {
        return null;
    }
    ObjectMapper objectMapper = new ObjectMapper();
    JsonNode json = objectMapper.createObjectNode();
    for (int i = 0; i < values.length; i++) {
        ((ObjectNode) json).put(headers[i], values[i]);
    }
    return json;
}
            }

The Result:

[{"Salutation": "MS.","LegalEntityId": "3.00E+14","FirstName": "Ciran","MiddleName": "Myle","LastName": "Machell","DisplayName": "Ciran Myle Machell","WorkPhoneCountryCode": "1","WorkPhoneAreaCode": "1","WorkPhoneNumber": "781-993-0000","WorkMobilePhoneCountryCode": "1","WorkMobilePhoneAreaCode": "1","WorkMobilePhoneNumber": "581-993-0000","HomeFaxCountryCode": "1","HomeFaxAreaCode": "1","HomeFaxNumber": "1111664","HomePhoneCountryCode": "1","HomePhoneAreaCode": "1","HomePhoneNumber": "122933334","NameSuffix": "Jr.","NationalIdExpirationDate": "1027428","WorkEmail": "[email protected]","AddressLine1": "Oracle Corporation","AddressLine2": "500 Oracle Parkway","AddressLine3": "null","City": "San Francisco","Region": "San Francisco","Region2": "CA","Country": "US","PostalCode": "94123","CitizenshipLegislationCode": "US","CitizenshipStatus": "A","PassportNumber": "11553397","PassportIssueDate": "37621","Religion": "CHRISTIAN","LicenseNumber": "9955501858","DateOfBirth": "33033","Ethnicity": "8","Gender": "F","MaritalStatus": "S","NationalIdCountry": "US","NationalId": "254-44-3022","NationalIdType": "SSN","UserName": "MachellCira","AssignmentName": "Analyst","BusinessUnitId": "3.00E+14","JobId": "3.00E+14","WorkerCategory": "WC","AssignmentCategory": "FR","WorkingAtHome": "N","WorkingAsManager": "N","SalaryCode": "H","WorkingHours": "12","Frequency": "D","SalaryAmount": "100000","SalaryBasisId": "3.00E+14","ActionCode": "HIRE","ActionReasonCode": "NEWHIRE","AssignmentStatus": "ACTIVE","ManagerType": "LINE_MANAGER"}]

The Desired Output:

{
  "Salutation" : "MS.",
  "LegalEntityId" : "300100003448002",
  "FirstName": "Miranda",
  "MiddleName": "Kyle",
  "LastName": "Rachell",
  "DisplayName" : "Miranda Kyle Rachell",
  "WorkPhoneCountryCode" : "1",
  "WorkPhoneAreaCode" : "1",
  "WorkPhoneNumber" : "781-993-0000",
  "WorkMobilePhoneCountryCode" : "1",
  "WorkMobilePhoneAreaCode" : "1",
  "WorkMobilePhoneNumber" : "581-993-0000",
  "HomeFaxCountryCode":"1",
  "HomeFaxAreaCode":"1",
  "HomeFaxNumber":"1111663",
  "HomePhoneCountryCode":"1",
  "HomePhoneAreaCode":"1",
  "HomePhoneNumber":"122993333",
  "NameSuffix":"Jr.",
  "NationalIdExpirationDate" : "4712-12-31",    
  "WorkEmail" : "[email protected]",
  "AddressLine1" : "Oracle Corporation",
  "AddressLine2" : "500 Oracle Parkway",
  "AddressLine3" : null,
  "City" : "San Francisco",
  "Region" : "California",
  "Region2" : null,
  "Country" : "US",
  "PostalCode": "94065",
  "CitizenshipLegislationCode" : "US",
  "PassportNumber" : "11557799",
  "PassportIssueDate" : "2002-12-31",
  "Religion" : "CHRISTIAN",
  "LicenseNumber" : "9955500858",
  "DateOfBirth": "1990-09-09",
  "Ethnicity": "8",
  "Gender" : "F",
  "MaritalStatus" : "S",
  "NationalIdCountry": "US",
  "NationalId": "554-44-3025",
  "NationalIdType": "SSN",
  "UserName":"rachell",
  **"assignments" :  **
    [
    {
     "AssignmentName": "Rachell_Assignment_1",
     "BusinessUnitId" : "202",
     "JobId" : "18",
     "WorkerCategory" : "WC",
     "AssignmentCategory" : "FR",
     "WorkingAtHome" : "N",
     "WorkingAsManager" : "N",
     "SalaryCode" : "H",
     "WorkingHours" : "12",
     "Frequency" : "D",
     "SalaryAmount" : "100000",
     "SalaryBasisId" : "100010024999994",
     "ManagerAssignmentId" : "389",
     "ManagerId" : "383",
     "ActionCode" : "HIRE", 
     "ActionReasonCode" : "NEWHIRE",
     "AssignmentStatus" : "ACTIVE",
     "WorkTaxAddressId" : "300100011952957",
     "ManagerType" : "LINE_MANAGER" 
     }
     ]
}```