The developer of a new home-made app claims that it allows for the streaming of PC games to the Nintendo Switch. Unlike many other similar attempts in the past, this version apparently has reduced latency and allows for the full control of said games. It is currently available for Windows only, however.
https://www.notebookcheck.net/New-app-on-GitHub-may-bring-PC-game-streaming-to-Nintendo-Switch.380996.0.html