https://www.cnet.com/news/mario-kart-8-deluxe-gets-nintendo-labo-support/

A free software update for Mario Kart 8 Deluxe on the Switch makes the game compatible with the Labo's Toy-Con Motorbike setup. Did we mention it's free?

The Toy-Con Motorbike comes in the Labo Variety Pack, along with the fishing rod and piano, and uses the Switch's Joy-Con controllers to turn cardboard handlebars into motion controllers. Until now, it's been usable only with a mini game built for the Labo.