It has been done in the past using dynamic images in a document template. What you have to do is first render the graphs on the screen, then convert these to images and save these in the mendix system with a reference to another object. Once this is done you can view the images in the document template.
I have seen it done before so know its possible, i just don't know the technical pieces of it.
Its not much fun to get it working, but it is possible.
http://stackoverflow.com/questions/11138852/render-and-export-fusioncharts-on-the-server
We use jaspersoft to create a custom report. However this will not run on a public cloud slot atm.