grouping and folding grease pencil layers, similar to collections

I will like a feature that makes it possible to group and fold multiple layers for easy organization. For examples, in the images I attached let's say I want to create groups Mel and Ford and put the layers in the corresponding groups so that I can fold them when I need more space and toggle the visibility, lock and every other thing as a group. I hope that's clear enough. Thanks for the good work.