Neither Bitwig nor Live sends audio levels over MIDI, so there was nothing to map on your side: this is now built into Zonea 3.1.14, out today.
Update Zonea and let the installer refresh the Zonea Bitwig script (or copy it from Documents\Zonea\DAW Scripts if you keep your controller scripts elsewhere). Then select a Hybrid VU or Peak Meter, open Events, go to the DAW tab and pick a Target: Master, Selected or a Clip Grid ring track (1 to 16). The meter shows that track's real audio level, left and right on a stereo Peak Meter or a two-needle VU, with no MIDI mapping at all. Ring targets follow the ring as it moves, so eight meters on Track 1 to 8 always match the faders next to them.
The same works in Ableton Live through the Zonea Live script.