You can always wrap the list in a div with attributes and then use a child selector in your CSS:
``````markdown
::: {#my-list}
- This
- That
:::
``````
``````css
div#my-list ul {
/* Put your style here */
}
``````
Not the most concise or pretty HTML or CSS imaginable but it works!
On occasion I have used Mojo::DOM[^1] to post-process such HTML to actually attach the attributes to the contained element and remove the div or span, but its mostly overkill unless you have to adapt to some existing common CSS, since hardly anyone will look at your HTML source or CSS anyway.