How to see iCloud Photos on Apple Watch SE for kids?

My daughter uses iCloud Photos with her iPad and MacBook (she doesn’t have an iPhone). I just got her an Apple Watch SE 2nd gen Cellular, which has iCloud Photos enabled on it, yet no iCloud Photos appear on the watch. Other iCloud services work as expected, e.g. Messages in iCloud and Contacts are syncing correctly to the watch.

I know I can sync photos from my iPhone to her watch, but that’s not what I’m looking to do.

I can’t find any documentation from Apple about iCloud Photos for Apple Watch for your Kids, but my expectation is that it would be syncing photos from iCloud just like iMessage and Contacts. Does anyone have any insight on why this isn’t working? Thanks!