Fetching data from a REST call out of JSON result

I'm still learning many basic steps in Bonita, so sorry if this is a stupid question ...

In order to do some automation in processes, I call the REST API of another application, which returns a JSON encoded string with three values, one or two of which I'd like to store in a BPOject in Bonita for further use.

I have the connector set up correctly to do the REST call, with a some sample data for now.