1Password charges a lot for their service and they’re a big company, so they can afford to offer things like this. Enpass is less expensive and doesn’t charge a subscription fee, so you can’t really expect them to offer a bunch of third-party services for no charge.
Honestly, it is easy to implement on your own with a gmail account or any hosted email service that lets you set up your own email aliases. I’ve been doing this for many years now.
As noted, if you have iOS or a Mac and iCloud+ that is another easy option.