No, there is no similar feature. And probably won't be (to rip the band aid off). Sigil's Editor should not be thought of as a full-featured code editor. It never will be that. That's why we made it possible for people to use their favorite code editors using Sigil's "Open With" feature (though that may not help present available classes from linked stylesheets in this particular case).
This is also not the sort of thing that would lend itself well to a Sigil plugin. Plugins have no way of altering Sigil's gui experience. So they cannot be used to enhance Code View's feature set.
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