How to access CI model in a plain php file?

I have file at this location of my CI4 project

Code:

CI4/public/star/ratings.php

My model file is at

Code:

CI4/Application/Models/StarModel.php

Is it possible to access this Model in the ratings.php?

I tried

Code:

<?php
use App\Models\StarModel;
$starmodel = new StarModel();
?>

I expected it not to work and it didn't. I know I need to get the namespace structure right. What's the correct way? Thanks