Wikitext not working inside property displayed with show
From semantic-mediawiki.org
Fragment of a discussion from Help talk:Inline queries
I checked #set on an old SMW Version 1.7.0.2 and the notion of {{#set: Intro section={{{Intro section|}}} }} would not create any annotation within a normal wikipage because the #set only works on an invoked Parser object (which does the pre-processing, template parsing etc.) this means any pre-parsing of template content need to be finished before #set is called.