Actually, as long as you are ok with the whisper, you can do something now.
The idea is you would define a custom tool to categorize a topic (or tag a topic) then you would have the persona call it.
Curious to see how this approach works for you, you will need to test the tool, it should be quite straightforward from the tool UI.
It is quite cumbersome to swing all of this, but also it is pretty 
that it can be done. The whisper is actually reasonably useful cause it gives you a bit of a “thinking process” of how the responder came up with the tags/categories.