Semantic html in joplin and/or janis

Atm, Wagtail only allows content to tag stuff as h1 or h2. It sounds like we've limited some options to make final presentation as clean as possible.

However, this seems like the opposite approach to me. Properly tagging content is important for accessibility and site structure, we can always match styling of headings if needed.

For example:
https://xd.adobe.com/spec/3693e3d0-1e3d-4c07-6555-b09fccd75568-40a2/screen/c705ecd2-99e8-4bdd-ae3b-1020d9fe0fe0/OPO-Information-Investigation-Process-1/

Other related readings:
http://accessiblehtmlheadings.com/
https://www.nomensa.com/blog/2017/how-structure-headings-web-accessibility
https://www.lifewire.com/why-use-semantic-html-3468271