Formatting query builder output in laravel

Hello,

I made a query which looks like this:

$hotel = App\Hotel::where('hotel_id', 2)
            ->join('rooms', 'rooms.hotel_id', '=', 'hotels.id')
            ->join('cities', 'hotels.city_id', '=', 'cities.id')
            ->select('hotels.name as hotel_name', 'cities.name as city_name', 'rooms.name as room_name')
            ->get();

Which outputs:

Illuminate\Support\Collection {#852
     all: [
       {#847
         +"hotel_name": "testHotel",
         +"city_name": "Guba",
         +"room_name": "testroom1",
       },
       {#848
         +"hotel_name": "testHotel",
         +"city_name": "Guba",
         +"room_name": "testroom2",
       },
     ],
   }

As you can see hotel_name and city_name appear for every room. It's fine, but is it possible to make it something like this:

all: [
    +"hotel_name": "testHotel",
         +"city_name": "Guba",
       {#847 
         +"room_name": "testroom1",
       },
       {#848
         +"room_name": "testroom2",
       },
     ],
   }

I want to you use this in the Form Model binding.

Thanks.