I am really happy with the roon software, but I have on topic as a proposal.
I would be great, if it would be possible to cluster the favorites into genres, because the overview would be easier and easier to find an album.
I’ve moved your proposal into the Feature Suggestions category of the forum. Feature suggestions are always read by the Roon Labs team, but they will very rarely comment on them.
Don’t forget to Vote for your own proposal…
I don’t know if this approach would work for you, but for what it’s worth . . .
(I’m making the assumption that in your use, the hearted-tracks are not necessarily “favorites.”)
For true favorites, you could create a tag and then add your favorite tracks or albums to it. It would then be trivial to do a focus (or a saved bookmark) with the combination of a given genre and the “Favorite” tag.