Hi @jordansz
So actually, you can visit this cubepilot forum discussion to know more about it.
Link for the discussion :- Herelink with FPV glasses
You can use U green convertor to use the Fatshark goggles in herelink system but you will face a bit more latency than herelink system display. Almost applicable for general flying.
You can use U Green convertor to get this to work but you may face problems.