So I manage to convert some of my old post (eg HDHomeRun Viewer ) post to support Markdown.
I’m not sure if this is shared anywhere, or if Plex admins will like this, but here it goes:
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Edit the post of your choice.
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With your cursor in the textbox, right-click and click inspect.
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Locate the HTML Element:
<input type="hidden" id="Form_Format" name="Format" value="IPB"> -
Change it to:
<input type="hidden" id="Form_Format" name="Format" value="Markdown"> -
Edit your post and save it.

Enjoy
-zy / zynine