Google Maps Visualization: data-icon from a fileupload element?

[burghard]

I implemented a google maps visualisation with a data icon which should be picked from a file upload element of my underlying data table. It is not shown. I know that this is not an "image element". But in my case it is an uploaded image.
May be there is a short hack to get this working?

 

[burghard]

It seems, that there is none.