The Description will be displayed by the ImageInfo function if you have set the description in the Info drawer of the Suite window. You can’t set the description through code, except when you are using the CaptureScreen command to dynamically capture images.
We looked into this a bit but unfortunately there isn’t way to add an identifier at run-time to add additional information to the image being searched for.
But we think it’s an interesting idea and a creative way to take advantage of the exception mechanism and so we are looking at ways to add it for a future release.