stagfe/app/HttpModels/MeetingWithLobbyModel.php

<?php
namespace App\HttpModels;

use App\Models\Meeting;

class MeetingWithLobbyModel extends MeetingModel {

    public $lobby;

    public function __construct(Meeting $meeting)
    {
        parent::__construct($meeting);

        $lobby = new ClientLobbyModel($meeting->lobby);
    }
}