I embarked on a similar journey a few months back. I ended up discovering notion.so and I have been loving it! It's more of psudeo markdown, but I highly recommend it!
Can you give an example? It looks WYSIWYG from the web page...
I would encourage signing in and experimenting yourself! What I meant is that it has a ton of non standard markdown features, but it really is awesome! For example, embedded tables with tags and sorting.
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