ARCameraBackground with custom material - does it work yet?

I've found several old threads of people only getting a black screen when trying to get a custom material to work for the ARCameraBackground. I'm in the same boat. Is there a sample shader we have to base ourselves on perhaps?

 

Yes, custom background material works in AR Foundation as expected.
Depending on your target platform, you can make a copy of ARKitBackground.shader or ARCoreBackground.shader and write your own shader based on that.