This macro (like most macros) is simply not converted to any XWiki equivalent by the Confluence input filter, it just convert it to some macro with the same name.
Confluence input filter 9.1 introduce the concept of MacroConverter component so that anyone can convert a Confluence macro to an XWiki equivalent (if any exist) during the import. For that you need to write a component which implement interface org.xwiki.contrib.confluence.filter.MacroConverter with hint “details”. See http://www.xwiki.org/xwiki/bin/view/Documentation/DevGuide/Tutorials/WritingComponents/.
Still need to find time to document all that properly…
That’s how a macro is used. That’s what you will find in your imported confluence page (you need to look at the sources, the WYSIWYG is hiding all that).