Right now tags have their name stored in the data attribute data-tag-name:
Could there also be an attribute data-tag-group? It would make it easy to style and distinguish tags from different groups on the ux. A use-case where I find this especially helpful is on setups that only use tags. Then you likely have some top-level tags and it makes navigation more intuitive when tags from that group stand out with a distinct look.
I saw there was a request years ago for adding a css class. Bringing this up again as things might have changed and maybe it’s more straightforward to implement with data attributes as well?