I'm not sure if I'm answering your question correctly, but each markdown output will be within an <article class="markdown-body"> which you can then add any style that you wish. Since cli allows you to add a custom css which will be inserted after the GFM style.
If instead you're referring to adding something like:
paragraph is here
I'm not sure if markdown-it (the markdown parser I'm using) would support it. Feel free to add an issue to discuss further.
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