UVC extension controls can be mapped to V4L2 controls, but the call needs a GUID of the device. How do I get the GUID on my device? Here's the struct https://www.kernel.org/doc/html/next/userspace-api/media/drivers/uvcvideo.html#uvcioc-ctrl-map-map-a-uvc-control-to-a-v4l2-control
__u8    entity[16]      UVC extension unit GUID