Report only with Trend diagramm

I try to make a dashboard were I gather my java, dotnet and native coverage "trends" and nothing else.

So I'm interested in generating a report which only contains the trend diagram (Ii is produced by JavaScript which is part of the summery.html file).

Can NCoverReport just generate that diagram? Or might some other tool be helpful or do I have to parse the JavaScript by myself every time?

NCover does not currently have a report that shows just the overall trend of a project.