jobject alternative in system.text.json
public class MyDTO
{
public JsonElement ExtractedData {get;set;} = JsonExtensions.Null;
}
public static class JsonExtensions
{
static readonly JsonElement nullElement = CreateNull();
public static JsonElement Null => nullElement;
static JsonElement CreateNull()
{
using var doc = JsonDocument.Parse("null");
return doc.RootElement.Clone();
}
}