Simply put I'm suggesting a multi-line text field that can be secured.
Sites using multi-factor authentication (MFA) often have a set of recovery codes. One can't add these easily to Enpass as I don't have an option to have a secure text field.
While talking about fields it could be nice to have a master list of fields that are already setup and can be added to any item (ie, I just add the recovery codes field I've already added).