Custom Function value retrieval

Custom Function value retrieval

I have a custom function that is returning a string of Json values( i made it a string, bc anytime i set it as a Map it returned just the first value.) When I try to set a variable from the contents of this string it just returns the entire string. How can I get a specific element of a Json String on the parameter screen.  I am able to see the string as ${RetrievalAndClean_2} and want to get a specific element from it. 

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