Add Custom Column to Yajra Datatable

blade file yajra table.js

var table = $('.contacts_table').DataTable({
                    processing: false,
                    serverSide: true,
                    pageLength: 15,
                    lengthChange: true,
                    lengthMenu: [[10, 25, 50, -1], [10, 25, 50, "All"]],
                    dom: 'Bfrtip',
                    buttons: [
                        {
                            extend: 'excel',
                            text: 'Excel',
                            className: 'btn btn-default',
                            exportOptions: {
                                columns: [ 0, 1, 2, 3, 4]
                            }
                        },
                        {
                            extend: 'pdf',
                            text: 'PDF',
                            orientation: 'landscape',
                            className: 'btn btn-default',
                            exportOptions: {
                                columns: [ 0, 1, 2, 3, 4]
                            },
                            customize: function (doc) {
                                doc.content[1].table.widths =
                                    Array(doc.content[1].table.body[0].length + 1).join('*').split('');
                            }
                        },
                        {
                            extend: 'print',
                            text: 'Print',
                            className: 'btn btn-default',
                            exportOptions: {
                                columns: [ 0, 1, 2, 3, 4]
                            }
                        }
                    ],
                    ajax: "{{ url()->current() }}",
                    columns: [
                        {data: 'name', name: 'name'},
                        {data: 'mobile', name: 'mobile'},
                        {data: 'email', name: 'email'},
                        {data: 'status', name: 'status'},
                        {data: 'created_at', name: 'created_at'},
                        {data: 'deleted_at', name: 'deleted_at'},
                        {data: 'action', name: 'action', orderable: false, searchable: false},
                    ]
                });
            });

ContactController.php

 /**
     * @return JsonResponse
     * @throws \Exception
     */
    public function index(Request $request)
    {
        if ($request->ajax()) {
            $data = Contact::with(['user'])->where('created_by', self::getUserId())
                ->orderBy('created_at', 'desc');
            return Datatables::of($data)
                ->addColumn('status', function ($row) {
                    return '<span class="badge badge-' . $row["status_color"] . ' text-white">' . $row['status'] . '</span>';
                })
                ->addColumn('created_at', function ($row) {
                    return $row->created_at->format('Y-m-d, h:i:sa');
                })
                ->addColumn('action', function ($row) {
                    $viewBtn = '';
                    $viewBtn .= '<a class="btn btn-sm btn-info" href="#"><i
                                                    class="fa fa-eye"></i>&nbsp</a>&nbsp;';
                    $viewBtn .= '<a href = "#" data-toggle = "modal"
                                                   data-target="#edit" data-name = "' . $row['name'] . '"
                                                   id = "' . $row->id . '"
                                                   class="btn-sm btn global-background text-white edit-btn" ><i
                                                        class="fa fa-pencil-alt" ></i ></a>
                                                <form style = "display: inline-block" class=""
                                                      action = "' . route('backend.contact.contact.destroy', $row->id) . '"
                                                      method = "POST" >' . csrf_field() . method_field('DELETE') . '<button
                                                        class="btn btn-danger btn-sm delete-user" type="button" ><i
                                                            class="fa fa-trash-alt" ></i ></button >
                                                </form >';

                    if ($row->deleted_at != null) {

                        $viewBtn .= '<a class="btn btn-sm btn-info" href="#"><i
                                                        class="fa fa-undo"></i>&nbsp;Restore</a>';
                    }
                    return $viewBtn;

                })
                ->rawColumns(['status', 'created_at', 'action'])
                ->make(true);
        }

        $data = [
            'title' => 'Contacts',
            'statuses' => $this->getContactStatuses(),
        ];

        return view('backend.contact.contact.index')->with($data);
    }