As someone flying with the CV1, I have to agree. Zooming in VR exists in DCS and Il-2 BoX/FC and it literally is essential in both. And it does work great there.
BTW I guess my Touch controllers are recognized by FS as I do have “Touch Pointer” listed there, but I haven’t been able to map anything to those. Might be WIP though. I’d probably map zoom to the A button then and also to the Context menu key, just as I did in DCS (well, remapping the controller isn’t possible there either, that’s just the default and I’m used to it).