When the joy-con controllers arrived I managed to work out which buttons on the controller mapped to which joystick button in Unity. I posted my findings on line in a couple of places and got a very good reaction. When searching for unity mapping of nintendo switch controllers the first couple of links on google are all my posts!
The official Unity forums, I posted an info graphic around the mapping.
Reddit is a much bigger forum for these type of things, so posted it there as well. This got a huge reaction from the community!