Easier way to change the existing account email to Masked Email

FWIW I just changed my email address on ups.com and created a masked email there. Problem was, the masked email was nowhere to be found in 1Password. I was able to use "Fill in masked email", but had to manually save the login. Now the result is that it's treated like a regular email, i.e. there's no FM icon or the option to block the masked email.