This is the standard format. It is essentially a digital version of the game cartridge or eShop download.
Q: What are the system requirements for playing Clannad on the Switch? A: You'll need a Nintendo Switch console, the NSP file, and a compatible USB drive or SD card. clannad switch rom nsp update link
Move the NSP or NSZ file to your microSD card or prepare it for USB installation. This is the standard format
Once you have located a link and downloaded the update file, follow these steps to get it running on your CFW (Custom Firmware) enabled Switch: the NSP file
Which of these would you like?