Get "results" of a built-in WAB widget within Geocortex Workflow 5 set feature attribute tool.

I would like to be able to get the "results" of an existing web app builder widget. When I use the select features - or filter features widget - I would like to be able to use these selected features or filtered features within the Set Feature Attribute tool within workflow 5. Right now it is asking for a URL. How do I get the selected set or filtered set "URL"??? These seems like it should be an easy thing to do.