Is it possible to add missing markdown headings

If we could get

# Heading one
## Heading two
### Heading three

to...

Heading one​

Heading two​

Heading three​

...and link and image support [https://test.com](test)...

...that would be great! Is there a way we can add this on ourselves?

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source https://xfworld.net/threads/is-it-possible-to-add-missing-markdown-headings.47864/