pinch to zoom to midi CC, how to simulate continuous zooming

Hello, my software have a vertical zoom feature that is only compatible with mouse wheel (shift command wheel) not the trackpad. Horizontal zoom is working fine tho.

I tried to convert shift+2 finger pinch with BTT into a midi CC, that my software then use to send vertical zoom commands. But instead of continuous zooming, I get 1 vertical zoom tick for a full pinch gesture on my trackpad range

any tips ?

the software also accept shortcuts as zoom commands

Thanks