It is now possible to use OTP for 2FA for system login.
This requires an OTP key. It will be useful to have this capability directly from the VyOS CLI.
Suggested commands to get started:
Simple command (with default parameters):
generate system login username usr4 otp-key hotp-time
Complete command:
generate system login username usr4 otp-key hotp-time rate-limit 5 rate-time 60 window-size 15