time ago, I wrote a ReaJS script just for that (or something similar, in the video there are no details about which note is given AT). My script uses the Channel AT information and sends it as Poly AT, using the last note played as note information.
You can find the latest version here (see the start of the thread for details):
The idea started while discussing the GX-80 by Cherry Audio:
It would be easy, I guess, to implement it as a filter, maybe @brad has already logged it in trello but it would require some interest in it from the community to give it higher priority.