How to generate a dashboard in RTC for two or more parameters?

Currently RTC provides a way to create DashBoard with widget like Workitem statistics - but with one parameter only.

I want to generate dashboard with multiple parameters for Workitem type as Defect

Say a report for "Filed against" and "Severity"

In the Settings there is only one row for Parameter selection

if there are two rows here, this problem will get solved

there are other widgets like "Open vs Closed Story Points by Iteration" but they are for Story points and not specific to Defects

Is there any other way to achieve the same ?