It would be great to be able to store some arbitrary data that can be retrieved as part of the leaderboard results. My use case is to store player customisation data so I can then render the remote player.
I have worked around this for now by using the AvatarURL string as a generic data store. Given the 200 character limit though I have had to store an optimised version of the data rather than the JSON string I would like to store, thsi adds extra complexity in serialising/deserialising (that is then duplicated between client and CloudScript).
Some other threads asking for a similar feature (going as far back as 2016 where this feature seemed to be on the way):