SnapLogic - Integration Nation

Hi there, I have a GraphQL Client snap with a query which works well when i hardcode an ID I am looking to search. However I want to replace this hard coded ID "screenshot 1 in blue" with a variable which I define in an earlier mapper snap screenshot...

I am trying to build part of a pipeline here which checks salesforce to see if a reqestor (contact) is created. If it is not in Salesforce, it routes to a branch to create the contact. I then want this new contact id inserted back into the pipeline f...