'Azure Data factory web activity response parsing

I have a data factory and have a web api GET activity . i see the response from the API is something like

"RESPONSE": [\r\n {\r\n "thevalue1" : "1234", \r\n "thevalue2" : "1234"]

I believe it is a string , I would like to get certain key value pair , how can I do that ? Using look up ? or expression on variable



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