Currently, Genshin Impact supports cross-save between PC, Mobile (Android/iOS), PS4, and PS5, allowing you to access your game data across these platforms by using the same miHoYo account13. However, the game has not yet been released on the Nintendo Switch, and there is no official information on whether data will be transferable to the Switch or Switch 2 once it becomes available1.
If Genshin Impact does eventually release on the Switch, it's likely that data transfer will be possible if the game integrates with the miHoYo account system, similar to other platforms. However, this is speculative and depends on future updates and announcements from the developers.
Regarding the Switch 2, since it is designed to be compatible with existing Switch games, if Genshin Impact is released on the Switch, it would likely be compatible with the Switch 2 as well. However, specific details about data transfer between platforms, including the Switch 2, would need to be confirmed by the developers once the game is available on these platforms8.