I have a particular feature request within the directive-like syntax, for which here is an example.

The code below

:::main{#readme}

Lorem:br
ipsum.

::hr{.red}

A :i[lovely] language know as :abbr[HTML]{title="HyperText Markup Language"}.

:::

may change to

<main id="readme">
  <p>Lorem<br>ipsum.</p>
  <hr class="red">
  <p>A <i>lovely</i> language know as <abbr title="HyperText Markup Language">HTML</abbr>.</p>
</main>

After being parsed and converted to HTML.

I'm asking for this because you know that Markdoc uses too many components and JS even when there is no need, like for a better image syntax in Markdoc you specifically need to create a component and link(maybe I'm not using the right word here) it to Markdoc.

Btw, I was inspired by remark-directive's code example. Though it's a code example but I think it's powerful for some really simple things.