I tried answering you on mozilla but moderated new user there, so here again:

Currently not possible it seems. https://docs.google.com/document/d/1i3IA3TG00rpQ7MKlpNFYUF6EfLcV01_Cv3IYG_DjF7M/edit?tab=t.0

Problem is that it runs in a whole other process - you can copy buffer content ofc but you cannot access shared buffers from the main thread.

So even if you force enable usage its unlikely you get the same data in the buffer.