Integrate 1Password App extension into Credential object?

Would it be possible to integrate the 1Password App extension into the Credential object?

This would make it easier for users to enter their credentials for a service.

I guess the Credential object would require a new field url which the script author has to set to uniquely identify the service, but the completion block could be hard coded by Drafts to set the username and password fields.

Integration in regular iOS Apps is not that hard and it might be an extra way to advertise Drafts, since AgileBits (creator of 1Password) lists Apps that use 1Password on their “Apps that love 1Password” page: