Have a look at this example workflow provided by KNIME.
Full location: knime://EXAMPLES/Users/knime/Examples/03_Visualization/04_Geolocation/06_Google_Geocode_API-OSM-text_file
Back-up:
This should help you further with the correct JSON Path. If this doesn’t solve the problem, please upload your JSON body so other people can work with it. It’s a bit too much to type over from a screenshot.