How to utilize addon data in an api Workflow?

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Hello all. I'm trying to take the Lat and Lng from this response, and use it in this same workflow to find a list of things that are within +or- .5 of that lat and lng. Anybody have any ideas on how to do that?
 
I want to query all a table off addresses, and find the ones that are within a certain range of these coordinates.
Then, I want to query another attached table for any lines that are associated with the addresses that were within that range.
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