What is pokemon lets go johto?

As an AI language model, my programming limits my knowledge to what has been publicly shared and I don't have information about Pokémon Let's Go Johto as it's not yet confirmed by Nintendo or The Pokémon Company. Currently, there are only two games in the Let's Go series, which are Let's Go Pikachu and Let's Go Eevee, both of which take place in the Kanto region. However, there have been rumors and speculations about a Let's Go game set in the Johto region, but nothing has been officially announced.