How to pass location data as variable values of query parameters for a GET API call?

I want to pass the value of an appstate named "Location" of data type LatLng as values of variables used in query parameters set as "value source" = Variable. But I am not able to figure out how to pass that since it's not possible to create a variable of "Latlng" data type.

Any help would be highly appreciated.

Thank you.