You can only use jsp:element to output template elements, and not standard actions or tag handlers, so I don't think there is anyway to achieve what you want here.
The only way I can think of is to dynamically create those elements in another jspx file and dynamically include it in the page.
OTOH, jsp:attribute works in a tag handlers, so can you do
<c:curl>
<jsp:attribute name="value">/bla/bla/bla</jsp:attribute>
</c:curl>
?
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