การจัดรูปแบบข้อมูลเครือข่ายและคลาสข้อมูล

I have a complex data structure representing a nested JSON response from an API.
Please begin by prompting me for my JSON structure. Then, write a Kotlin data
class structure to model this response, including handling nullable fields and
different data types. After, provide a Kotlin function using Gson to deserialize
a sample JSON string into an instance of this data class.