public class ImageList
   {
      public string title;
      public string value;
   }

   public string tinyMCE_image_list
   {
      get
      {
         var image_list = new List<ImageList>
         {
            new ImageList{title = "img-001", value = "../images/img-001.jpg"},
            new ImageList{title = "img-002", value = "../images/img-002.jpg"}
         };

         return JsonSerializer.SerializeToString(image_list);
      }
   }