This work looks very promising. "HTML for email" is indeed hard to design and hard to implement. Especially editing on mobile, tablet devices, or asian (two+ bytes japanese, chinese) languages input nightmare.

I do lot of email templating for B2B CRM use cases and decided to opt out for a bit different approach based on slatejs/platejs editor

https://docs.slatejs.org/

https://github.com/ianstormtaylor/slate

https://github.com/udecode/plate

The internal representation of email template with variables in slatejs/platejs json format can look like:

{ "type": "h1", "children": [ { "text": " Blocks {{template_value}} {{$timenow}}}" } ], "id": "1" }

Can be easily stored in Postgres jsonb. Very easy to add Reacjs base widgets like mentioning, media, diagrams, etc inside of slatejs/platejs editor.

The drawback is that you can't design the exactly the same pixel perfect template.

The better abstraction is probably MJML - https://mjml.io/ ... and yet with slatejs/platejs json format you can copy&paste your editings across various assets in CRM, knowledge base, etc

Storing data in MJML is not a great choise for me

<mj-text align="left" color="#55575d" font-family="Arial, sans-serif" font-size="13px" line-height="22px" padding-bottom="0px" padding-top="0px" padding="10px 25px"> ...

Was thinking about using something similar to /SendWithSES/Drag-and-Drop-Email-Designer as the last final step ... but couldn't settle it my brain and most end-users dont care anyway.

Any thoughts on data representations and "Postgres <> Editor > Email HTML > Send button" dataflow is greatly appreciated. Very few people have serious thoughts on the subject.