Till now, Reports module has not a flexible framework so it is not viable to implement such a feature.
Whenever our customers ask for features which overcome built in features and extensible approaches, we arquitect a flexible solution which fits that very requirement and also some other related ones.
For this purpose we built a framework called advanced reporting, which renders just like a saved report chart dashlet, and support a set of custom filters. Views created after this framework fetch data from SugarQuery object and sql queries as well.
Indeed this framework also allow to render in a chart data from different modules, like calls, tasks, meetings.
