During the latest Direct, it was revealed Virtual Boy games would be joining the 'Nintendo Classics' library early next year.
In case you missed it, there'll be a few (paid) gates you'll need to pass through before you can even access this particular library. Not only will you be required to have an active Switch Online + Expansion Pack subscription (aka the premium-priced tier), but you'll also need to fork out for an accessory.
Apart from this information during the broadcast, Nintendo has also made note of this on its official website:
"Virtual Boy for Nintendo Switch 2/Nintendo Switch and Virtual Boy (Cardboard Model) for Nintendo Switch 2/Nintendo Switch are required to play the Virtual Boy – Nintendo Classics collection of games. Nintendo Switch Online + Expansion Pack membership