QR code scanning is intended for mobile phone cameras as a way of communicating a TOTP secret. When presented with a TOTP secret, every website I've seen has p

QR code scanning is intended for mobile phone cameras as a way of communicating a TOTP secret. When presented with a TOTP secret, every website I've seen has presented the option to show the TOTP secret as text, which can be copied across. A password database like KeepassXC can store the TOTPs. FIDO / U2F hardware like Yubikeys (or various alternatives) are also a convenient second factor.