ESRB rates 'Ni no Kuni II: Revenant Kingdom Prince's Edition' for Nintendo Switch
Ni no Kuni II originally released for PlayStation 4 and PC in March 2018, published by Bandai Namco and developed by Level-5. Bandai Namco has not officially announced a Nintendo Switch version.
The Prince's Edition specifically was a version of the game that included a steelbook and Season Pass, so perhaps this listing is for a port of the game that includes all the post-launch DLC.
Bandai Namco released a Nintendo Switch port for the original Ni No Kuni in September 2019, so there is some precedent for late Switch ports of the franchise. Ni no Kuni II stars a different cast of characters compared to the first game, so you do not necessarily have to play the two titles in order.
If you haven't had a chance to play Ni no Kuni II, you can check out Zack's review of the game.