Yes. You just need a way to get the tags there.
At the level of sysfs it is fairly general.
Getting through the kobject layer is a different story.
I suspect since you are working on this and I seem to be stuck
in molasses at the moment it makes sense to figure out what it
will take to handle the uid namespace before pushing these
Taking a quick look and having a clue what we will need to
do for a theoretical device namespace is also a possibility.