javascript push to object that contains key [closed]

How do I push the sample object below to this.tableData.columns.actions without looping since they are multiple objects inside the columns array ?

So basically I want it to push the object to actions array.

#object to push

let a = {icon:’insert_chart’, name: ‘Send’, class:’primary-color’, disabled : false},

#original object

this.tableData = {
      columns:[
    {id:'name',name:'Name'},
        {id:'description',name:'Deal Description'},
        {id:'action', name: 'Actions', actions:[
          {icon:'file_copy', name:'Copy', class:'primary-color' , },
          {icon:'delete', name: 'Delete', class:'mat-error ml-7px', disabled : false},
        ]}
   ],

#finalOutput

{
      columns:[
    {id:'name',name:'Name'},
        {id:'description',name:'Deal Description'},
        {id:'action', name: 'Actions', actions:[
          {icon:'file_copy', name:'Copy', class:'primary-color' , },
          {icon:'delete', name: 'Delete', class:'mat-error ml-7px', disabled : false},
          {icon:'insert_chart', name: 'Send', class:'primary-color', disabled : false},
        ]}
   ],