Inspired by the phanan/cascading-config package.

composer require dimbo/cascading-config

Add the LoadCascadingConfiguration class to the Kernel's bootstrappers section right after LoadConfiguration:

    protected $bootstrappers = [
        //...
        \Illuminate\Foundation\Bootstrap\LoadConfiguration::class,
        \Dimbo\CascadingConfig\LoadCascadingConfiguration::class,
        //...
    ];

Remember to do that in both app\Console\Kernel.php and app\Http\Kernel.php.