create a new object CI4

Goodmorning everyone,
i am using codeigniter version 4 rc3.
I would like to create a model object for CI3 compatibility.

PHP Code:

<?php namespace App\Controllers;

use App\Models\MO_Home;

class Home_1 extends BaseController
{
    
    function __construct(){
        
        $model= new stdObject();
        $this->model->MO_Home = new MO_Home(); 


usage

PHP Code:

public function index()
 {
    echo $this->model->MO_Home->call_function(); 


It gives me error in creating the object.

Thank you