using System;

using System.Text.Json;

​

public class PromptTemplate

{

    public string Prompt { get; set; }

}

public class Program

{

    public static void Main()

    {

        PromptTemplate p = new PromptTemplate

        {

            Prompt = "Testing\nNew\nLine"

        };

​

        string jsonString = JsonSerializer.Serialize(p);

        Console.WriteLine(jsonString);

    }

}