[racket] Scribble srcdoc and macros

Is there a form similar to proc-doc/names but for providing syntactic forms
instead? Something where it expands to using @defform instead of @defproc.
It looks like thing-doc might work, but that's meant for arbitrary values
and I'm really looking for something specifically meant for exporting
syntactic forms. If no such thing exists, how would an implementation based
on thing-doc look exactly?
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