如何在转换为json时将内部类的所有属性作为外部类的一部分获取

public class OuterClass {
    private String outerProperty;
    
    public class InnerClass {
        private String innerProperty;
        
        // Getters and setters for innerProperty
    }
    
    // Getters and setters for outerProperty
}

OuterClass outerObj = new OuterClass();
OuterClass.InnerClass innerObj = outerObj.new InnerClass();

Gson gson = new Gson();
String json = gson.toJson(innerObj);

JsonObject jsonObject = new JsonObject();
jsonObject.addProperty("outerProperty", outerObj.getOuterProperty());
jsonObject.addProperty("innerProperty", innerObj.getInnerProperty());

String json = gson.toJson(jsonObject);