Return json from two classes in model - json

Question

I'm trying to return json with two classes in my model
public function both()
{
return $this->belongsToMany(Car::class)->and(Driver::class)->withPivot('type'); // this is wrong
}
the reason I'm trying to get this like that is because in my function
public function check()
{
$user = JWTAuth::parseToken()->authenticate();
$id = $user->id;
$result = User::with('both')->where('id', $id)->get();
return response()->json($result);
}
right now in my model I have this
public function both()
{
return $this->belongsToMany(Car::class)->withPivot('type');
}
public function driver()
{
return $this->belongsToMany(Driver::class)->withPivot('type');
}
But the function returns json that has a different structure when both ends.
My question is can I have the function return a json with the same structure?
like this
[
{
"id": 4,
"name": null,
"phone": "9000",
"size_of_house": null,
"created_at": "2016-12-04 13:55:52",
"updated_at": "2017-03-08 14:03:44",
"deleted_at": null,
"both": [
{
"id": 177,
"name": "NIS",
"created_at": "2016-12-27 10:28:29",
"updated_at": "2016-12-27 10:28:29",
"pic": "http://localhost:8000/images/1482833485.jpg",
"pivot": {
"user_id": 4,
"car_id": 177,
"type": "car"
}
},
"both": [
{
"name": "Abdulaziz Alomhsen",
"age": "30",
"created_at": "2017-02-28 09:36:15",
"updated_at": "2017-03-08 08:46:06",
"status": "جايه",
"pic": "http://localhost:8000/images/1488714520.jpg",
"id": 2,
"pivot": {
"user_id": 4,
"driver_id": 2,
"type": "driver"
}
},