How to enable GarageBand pitch control MPE Keyboard

I received a request from one of my customers to enable control of my synthesizer from iOS GarageBand using the pitch keyboard. This seems to be a good quality software mpe controller.
The synthesizer has been tested on roli hardware and is built around the MPEsynthesizer class. However in garageband the pitch keyboard is not listed.
I am guessing there is a flag somewhere to declare that the auv3 will respond to MPE.
I’ve been searching through apple’s auv3 documentation and juce documentation, to no avail so far.
If anyone can kindly point me in the right direction, it would be much appreciated.