"Prefer external GPU" in Monterey?

I'm trying to use the new Object Capture API with my Intel machine that has a a big fat external GPU.

Unfortunately, the API does not allow GPU selection. Now, you used to be able to hit CMD+I on an app and check "Prefer external GPU" -- this seems to have been a working workaround for PeterKolsky here, for this exact specific case:

https://developer.apple.com/forums/thread/681861?answerId=677919022

(scroll down to PeterKolski's comment --- this site does not allow a link to that answer directly for reasons)

Now, what happened to that prefer eGPU checkbox? I don't see it. It was there in Big Sur, but not in Monterey.

How do I tell an app to prefer the external GPU in macOS 12?

can't find anything about this change in the beta release notes.

thanks