Have you tried out these features yet?
At the end of July, Nintendo released an update for the Switch Online Super Nintendo app adding Mario Paint.
This update included mouse support (for Switch 2 Joy-Con 2 controllers and USB mouse compatibility), as well as the ability to remap buttons. The same update also featured mouse support for the existing releases Nobunaga's Ambition and Mario Super Picross.
Read the full article on nintendolife.com