There’s a UVC class in TinyUSB. We use TinyUSB for all boards except ST boards, and MicroPython now supports creating USB devices dynamically from Python. These are somewhat new features and not fully tested. That said, I’ve been thinking that at some point in the future, we may have the ability to create a UVC device from Python. This would enable it for all boards, except for ST boards that use ST stacks. However, even ST boards may be switched to TinyUSB at some point in the future.
All this is to say that we may have UVC as a standard feature for all boards, but I can’t promise anything right now.