How to add row number or Serial no in laravel datatable

This is the bill_info table, for which i need to serialized row no like 1 2 . . . . . . . . . . . . .n

There is data list returned, how I can get serial_no custom field in datatable list view.

    $data = BillInfo::get(['bill_info.*']);    return Datatables::of($data)                    ->removeColumn('id')                    ->make(true);