In the normal login scenario, the verification code is copied to the clipboard after filling login/password.
However there are scenarios where you are redirected to the OTP verification page such as https://www.npmjs.com/escalate/otp which you get after npm publish from the terminal.
For this case, OTP is available but it requires mouse clicks to copy the desired OTP code.
It would be handy to have a keyboard shortcut for such cases.