I am trying to achieve something like this:

where the @qualifier Thread-safe has a different background-color than inline.
Unfortunately this is not possible because all qualifiers are rendered as <span class="mlabel">...</span>

I would like to purpose to change this command into something like that:

\qualifier <name> | "(text)" [<label>] --> <span class="mlabel label">name | "(text)"</span>

where <name> | "(text)" is displayed to the user, and <lablel> is used as the value for the class attribute.