I had a great time checking this out for TTRPGkids, and I think this can work great on its own or can be an awesome add-on to an existing TTRPG campaign - I'm thinking like your party of adventurers finds a pocket dimension full of the guardians who then help them on their journey.  I've got a full review on TTRPGkids below, and this is an awesome idea!

https://www.ttrpgkids.com/2025/01/23/review-of-gratitude-guardians/