Thanks for moving the question to the forum @CherriGirl.
Just to confirm before I loop others in - are you proposing here that the multiple GPUs are on the client side device or are you looking to leverage remote GPUs on other client machines somewhere else to do some work?
My main concern here is that if it is to leverage multiple GPUs on one machine (Eg yours) extremely few people have multiple GPUs at home to make use of that if it were possible (and is most likely dependent on OS/Browser if that is even possible).
If you are talking about leveraging remote GPUs somehow via client side JS to distribute training or such, then that seems like it could effect a larger number of people - especially given the GPU shortage right now and may have greater scope.
Let me know. Thanks!