Processing HttpCall Data

I've been able to build my flow with a HttpCall widget to hit a webhook. I've verified the CallerID is passing successfully to my webhook and my webhook is responding with the following:

{   "Data" : "{"Support_Level":"Priority"}"}

What I'm currently stuck on is how to get the Support_Level value mapped to my global variable global_custom.Support.Support Level to be used in a Condition widget.