namespace App\Models;

use Illuminate\Database\Eloquent\Casts\AsFluent;
use Illuminate\Database\Eloquent\Model;

class Passenger extends Model
{
    protected function casts(): array
    {
        return [
            'address' => AsFluent::class,
        ];
    }
}

 $passanger = Passenger::first();
 
 $passenger->address->get('office.street');
 $passenger->address->get('home.street');

use Illuminate\Support\Fluent;

 $passanger = Passenger::first();
 
 $passenger->address = new Fluent([
           'office' => ['street' => 'new street'],
           'office' => ['home' => 'new street']
])
 
 // by array
 $passenger->address = [
           'office' => ['street' => 'new street'],
           'office' => ['home' => 'new street']
]