This would be a huge enhancement as email-to-note is critical and often the only way to get a personal note uploaded from a locked down computer or from behind a corporate firewall which blocks uploads or access to online public file sharing services. Also, much of what I get that needs to be filled comes in via email and needs an easy way to move from email to my notes app. Evernote and other apps have had this for years.
with the actual structure is not possible to have this functionality, is virtually possible once we'll have a web version of Bear to catch mail and forward note to an iCloud account, but we still need to study if it's really possible.
For me, email-generated entries was a game changer for Evernote as well as for Things (Cultured Code). It is fast becoming a baseline offering in subscription models, so please make it one of your development priorities.