You could do them as git notes, which gives you a non-vendor specific mechanism for handling this kind of data in git. However, you do need to make a point about having changes to notes get pushed to version control, so it does require either a tool or onboarding to become useful for what you’re talking about.

Git can store a variety of other objects in the repo as well, but the built in git-notes mechanism springs most immediately to my mind as the thing you’re looking for.