Material Override to have a Collection associated with

My ideia is that Blender permits material overrides to be or not global, and when not global, to have a collection associated with. Consider this scenario: I want the shadows from hero character in a certain view layer, that way I would set material override to be a shadow catcher material, however I do not want the character to be a shadow catcher as well, thus, I would only turn on material override for a specific collection. PS: Further on we could consider to extend this to various materials overrides, each one associated with a specific collection. Thank you!