Support has been implemented, images for testing are ready:
We have some contradicting results regarding HDMI output with the Linux 6.1 image. It might depend on the board revision, and whether it is ZERO 3W or ZERO 3E.
Also, see end of the GitHub topic: The board exists with two different onboard WiFi chips, and we need to detect which one it is (hopefully cat /proc/device-tree/serial-number reveals it), in case change the used device tree, and probably need to add further firmware for the AIC8800 chip.
Please stick with discussion on GitHub now, so we have all info in one place.