A user of YouTube DreWoof has released a new video confirming the feat, which manages to connect the Joy-with the Pro Controller to a PC, even to a MAC or even Android.
How the Joy-with work with bluetooth you can connect other devices that operate in the same way, as the PC, MAC and Android.
As see in the video the controls work without problems, however them Joy-with is connect of form separate, or that work as two controls separate.
Unfortunately the PC not manages to recognize both controls as an only control-of the form in that work in the Nintendo Switch with them Joy-with attached to the console or to the grip- but something is something.