trackpad gesture support

I would like to have "proper" trackpad support in UTM (using Apple native Virtualization) for Linux guests. (see https://github.com/utmapp/UTM/issues/6527)

After forcing UTM to pass the trackpad to the vm directly it is detected as a "spice vdagent tablet".

However currently only "pointing" works no "clicking", and no gestures (not even scrolling).

I define proper support as:

• left click
• right click (two finger click)
• 3 finger click
• 3 or 4 finger swipe (left, right, up, down)
• pinch to zoom
• 2 finger scroll (vertical, horizontal)

Am I correct that there is currently no "real" trackpad support in vdagent (as in every pointer device is an emulated mouse)?

I can help with the implementation, any pointers as to where to start?