So this is a fairly big feature request, but everything needs to start somewhere. In the Movie metadata databases they have a feature called collections. This is where they group a series of related films together. An example is the Star Wars Movie Collection you can see it here https://www.themoviedb.org/collection/10
Scope could be as big as 'All sonic games' across all platforms, all versions of a single game across platforms e.g. Green Beret, or versions of a game on a single system 'Roland games on Amstrad CPC 464'
Primarily it helps you navigate to other versions or related games. This doesn't yet exist so there would need to be some community input to add Collections they wanted.