Yes there is, you could press it and put in a cocktail !
Seriously though you can very legaly copy the bios from your own officially bought switch, copy your legaly bought cartridge, and use them to play the emulator. All of which is legal, just like you could buy spare parts and build your own switch, and copy the bios from a legaly bought one. I'm not going to pretend people do that, but it is possible to use it in a legal manner.