How to get value of key when using jsonschema2pojo custom annotator on a input type of JSON

Question

I am creating the POJOs using jsonschema2pojo on inputtype of JSON ( not Json schema ). I need to add the APIModelProperty annotation to each primitive field and I would like to use the value as value for "example" parameter.

@ApiModelProperty(example="2020-02-03T00:00:00.000Z")

I do not want to manually add this annotation to each field afterr the schema is generated. So, I am trying to write a custom annotator that will add this annotation. From the examples I have seen, I am trying to use the

@Override
public void propertyField(JFieldVar field, 
                      JDefinedClass clazz, 
                      String propertyName, 
                      JsonNode propertyNode ) {

    System.out.println("propertyName " + propertyName);
}

This gives me the key names from the JSON. I have 2 questions

1. I want to add the @APIModelProperty annotation to each primitive field. How do I identify that propertyName field is a primitive and
2. How do I get the value of propertyName?

Example - "eventCreatedTime": "2020-02-03T00:00:00.000Z"

Thank you