No. All Switch system files are copyrighted by Nintendo. Open-source re-implementations (like SeaBIOS for PC) do not exist for Switch.
Downloading firmware and keys from the internet is considered and is illegal. The only legal way to obtain them is to "dump" them from your own physically owned Nintendo Switch console. download bios nintendo switch
Decryption keys that allow the emulator to read your game files. title.keys: Additional keys required for certain game updates and DLC. 2. How to Safely Obtain These Files download bios nintendo switch