Also, check out Generating charts using Image-Charts and QuickChart blog post!
One way would be to use R Shiny to generate more complicated graphs and embed them in your GuidedTrack program. Adding R Shiny content can be done easily using *video keyword. This is a very untrivial way to make it happen but it works because *video adds HTML5 content to GuidedTrack (not a video file) and R Shiny produces HTML5.