如何在对象内映射JSON数据对象?

I'm trying to fetch some data from a API call and map those objects to a model object. In my case I have an object inside an object. This is working and received JSON. And it's mapping fine with the very first object. In my JSON I have an array and another array inside it. So I did the following to get this done.I'm trying to fetch some data from a API call a