Update:
Jetpack now has its own built-in Markdown block:

I’d highly recommend using it instead :)
Original post below:
I’ve been playing around with Gutenberg a tiny bit recently and have realized that, at least in my case, it kind of eats the Jetpack Markdown module and doesn’t offer full markdown support.
I honestly know nothing about writing blocks for Gutenberg, but luckily GitHub user nuzzio does :)
This recent, but now closed PR to Jetpack was pretty much everything necessary to build a working block.
I’ve put my code up on GitHub as a WordPress plugin:
Like I said, I don’t know what I’m doing–so consider this plugin super beta.
I begin to hate Gutenberg. I use JP Markdown so I don’t need Jetpack and it won’t work in blocks. So I’m very happy to find your solution. I will try it – but still need Jetpack, how boring.
Thanks a lot for your sharing.
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You could also try EditorsKit Plugin – https://wordpress.org/plugins/block-options/ . Here’s the markdown preview : https://twitter.com/phpbits/status/1136104220233306112
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