public class MyDTO implements Serializable {
    private static final long serialVersionUID = 1L;

    private String id;
    private Map<String, String> names;

    // public Getters and Setters
}

private static FieldDescriptor[] myDTOFields() {
        return new FieldDescriptor[] { fieldWithPath("id").description("id description"), fieldWithPath("names").description("Names description") };
}

{
  "names" : {
    "en" : "test"
  }
}