[mixinix]

This is my poor skill and trick... and works.

PHP Code:

$psr4 = [
    APP_NAMESPACE                => APPPATH,
    'Config'                     => APPPATH.'Config',
        // Base Class
        'App\Base'                   => APPPATH.'Base',
];
        
$psr4 = array_merge((array)(@include(WRITEPATH . 'modules.php')), $psr4); 


In CodeIgniter4, many tricks and combinations I can do, everywhere and anywhere. Of course, with namespace.

../writable/modules.php

PHP Code:

<?php

return [
    'Module\Template\AdminLTE'   => APPPATH.'../modules/Templates/AdminLTE',
    'Module\Blog'                => APPPATH.'../modules/Blog',
    // Widgets
    'App\Widgets'                => APPPATH.'Widgets',
    // Third Parties
   'ThirdParty\Mixinix\Template'  => APPPATH . 'ThirdParty/Mixinix/CodeIgniter4-template',
    // From Github libraries
   'Pug'  => GITHUB_PATH . 'pug-php/pug/src/Pug',
   'Jade'  => GITHUB_PATH . 'pug-php/pug/src/Jade',
]; 


That modules.php file can be created and modify form database.