Usage of markdown syntax in sequence diagram comments

[WilbertOnGithub]

We can use the following syntax to create a comment on the foo element in a sequence diagram.

foo."This is a comment"

Since D2 also supports markdown syntax, I was expecting the following syntax to also work.

foo.|md
    # My markdown text here
    - list
    - list
|

This work without any syntax errors but the formatting supplied by Markdown is not applied. So the text is correctly rendered in the sequence diagram as a comment, but the header text stays the same.

Am I missing something or is this simply not supported for now?