Epic ‘kinda sorta’ does but i functionally require you to have a separate ‘game’ entry in your library.
Its not really like the Steam model where you can select a specific beta channel from potentially dozens of them.
I’m seeing it mostly for games that hvae an experimental type of build that they want people to test on, and a mainline build for everyone else. I guess they could somehow provide a ‘1.8’ version of the game maybe call it like Phoenix Point Classic or something.
On the GamePass thing though? They definitely do not have anything at all.