How to get the specific attribute from HTTP Response in Flowable Http Task

Question

I am running flowable maven dependency as a spring boot project (This project has flowable maven dependency and the bpmn model alone).

There is another micro-service (wrapper service) to access the flowable REST APIs to initiate the process and updating the tasks.

I have a Response Model.

Class TestResponse {
   String firstName;
   String lastName;
   String city;

}

There is an API, If I call that API from flowable Http Task, it will return the TestResponse.

My requirement is to get the value for city alone from the TestResponse.

In Flowable Http task properties, under Response variable name I specified city. but it seems like the value from the TestResponse.city is not stored in the city (Response variable name in Http Task property)

1. Is there any way to get the specific attribute from the Http Response and set it under Response variable name in Flowable Http Task property?

2. In addition, how can I get more than one attribute value from the Http Response and set it under Response variable name in Flowable Http Task property?