How to generate dynamic json object for request body

In the Request body below, the number of value "questionOne", "questionTwo", etc changes for each student. How can i dynamically generate request body to fit the changing value of the key and value.

Sample request one

"quiz": {  
   "name":"Jacob",
   "sid": "STD_500",
   "questionOne":"",
   "questionTwo":""
}

Sample request two

"quiz": {  
    "name":"Annie",
    "sid": "STD_200",
    "questionOne":"",
    "questionTwo":""
    "questionThree":"",
    "questionFour":""
}

Data class:

data class Quiz (
    val name : String?,
    val sid : String?,
     val questions: HashMap<String, String>?

     )

Solution

I suppose the only way would be to define quiz as being a HashMap instead of a Quiz object. I'm guessing you now have a RequestBody somewhere something like this?

data class RequestBody(
    val quiz: Quiz
)

Then change it to

data class RequestBody(
    val quiz: HashMap<String,String>
)

But it's kind of a bad design like this, I suggest to work out with the backend a solution as proposed by Tornike's answer