I understand that eSun used to sell filament refills that used a different spool size that Bambu Labs. Then they switched to cardboard.
But now they are offering “Refillaments” that seem to be compatible with Bambu Labs spools. (search eSun Refillament). You can get it with or without a reusable spool. I just got my first one (with spool) from Amazon and it looks to be completely compatible with Bambu Labs so you could put a Bambu Labs refill on an eSun spool or an eSun refill on a Bambu Labs spool. I like some of the eSun colors, so I am happy to be able to avoid the cardboard spools (just personal preference). The center hole is the right size for the AMS lite and it looks like it should be fine with an AMS from the specs, although I don’t have an AMS).
Maybe this is old news, but it was new to me and the eSun info says that it is a “new release detachable spool.”