test.cs

public class Location {
  public double x { get; set; }
  public double y { get; set; }
}

public class Pen {
  public string type { get; set; }
  public double objectWidth { get; set; }
  public double objectHeight { get; set; }
}

public class Annotation {
  public Pen pen { get; set; }
  public string user { get; set; }
  public Location location { get; set; }
  public long time { get; set; }
  public List<Comment> comments { get; set; }
  public string id { get; set; }
  public string image { get; set; }
}

public class Comment {
  public string comment { get; set; }
  public List<string> user { get; set; }
  public long date { get; set; }
  public string id { get; set; }
  public string status { get; set; }
}