I have never seen any temp. readouts for more recent AMD GPUs. Neither with MFC nor Hardware Monitor. I strongly doubt them to have any macOS-accessible sensor.
I've booted up with Windows 10 on my Mac and installed macfancontrol.... it does show the GPU Temps.... its probably just macOS and macfancontrol. Thanks again guys.
Maybe you can incorporate these sensors: https://github.com/aluveitie/RadeonSensor [2022-05-26 18:14:15:444] [thread 8670] [TempSensorProvider.cpp#68] TemperatureSensorProvider::loadAvailableSensor...