Wishlist in the store!
Not a big deal now since the library is still relatively small, but would be a great option once it gets bigger.
There is a wishlist, right? When viewing game details you can buy or "add to wishlist", and on the left panel of the store, with filters, one of the selections available is "wishlist".
I'm speaking of in the Quest... but just now realized maybe the companion app store is different (I haven't used it)?