Compatibility with Mail Merge

It is possible to use Markdown-Here-Revival 3 in combination with Mail Merge (another well known Thunderbird add-on): just write your template in markdown, convert it in HTML and then open Mail Merge. The sent emails are in HTML.

It doesn’t work wit Markdown-Here-Revival 4 beta: write your template in markdown, see the HTML version in the right panel and open Mail Merge. The sent emails are in HTML but display your markdown code instead of the HTML output.

I don’t know if it qualifies as a bug or if it’s more an enhancement request, but I think MHR4 should be usable in workflows (ie other add-ons should be able to use the HTML output as input), like MHR3.

I take for granted you know how works Mail Merge, but I realise that my Issue may seem very incomplete if you have never used Mail Merge. I can give you a MWE (or any other piece of information) if you need.