Hi niwo
Makes no sense to me to create a feature request if it's so simple as adding a filter to your site π
Anyway, what you added is not correct...
You know custom coding is out of the scope of our support service, but I'll do an exception this time as it should be pretty easy.
This is the filter you should add to your functions.php file:
add_filter( 'woocommerce_gla_supported_product_types', function( $product_types ) {
return array_merge( $product_types, array_keys( \AtumLevels\Inc\Globals::get_product_types() ) );
} );
I hope this helps.
Best Regards,
Salva.