Here's my attempt: https://codesandbox.io/s/9zo29v9k5o
Turns out it was an issue with remark-shortcodes version 0.2.0.
Did you succeed to make it work ? It seems that even with the previous version, the demo is not working.
Oh my bad, this is just the < characters in the plugin configuration which are in the wrong order.
Also, the shortcode have to have a blank line before.
Most helpful comment
Turns out it was an issue with remark-shortcodes version 0.2.0.