how to join 3 tables in laravel using eloquent hasmanythrough or hasonethrough

this is my tables look like

in my models this is how I do it but seems not working and I don’t know why:

public function departments(){
    return $this->hasOneThrough(
        subjectlist::class,
        department::class,
        'id',
        'course_id',
        'id',
        'id'

    );

the ouput when I try to user hasOneThrough:

         {
        "id": 1,
        "department_name": "Business",
        "head": "John smith",
        "email": "[email protected]",
        "contact_number": "09300282103",
        "created_at": null,
        "updated_at": null,
          "subject_list": {
          "id": 1,
          "course_id": 1,
          "subject_code": "Math1",
          "description": "math test",
          "year_type": 1,
          "price": "200.00",
          "units": "5.00",
          "created_at": null,
          "updated_at": null,
          "laravel_through_key": 1
         }
    
    },

I wan’t the output should be like this please help me how to do it:

     {
    "id": 1,
    "department_name": "Business",
    "head": "John smith",
    "email": "[email protected]",
    "contact_number": "09300282103",
    "created_at": null,
    "updated_at": null,
       "subject_list": {
       "id": 1,
       "course_id": 1,
       "subject_code": "Math1",
       "description": "math test",
       "year_type": 1,
       "price": "200.00",
       "units": "5.00",
       "created_at": null,
       "updated_at": null,
       "laravel_through_key": 1
      },
      department {
        "id" : 1,
        "department_name" : "ComputerScience"
      }
    },