Make rollup fields available in Portfolio Dashboards

I want to create a chart in my portfolio dashboard that uses a numerical rollup field as the y-axis and another custom field in my portfolio on the x-axis. However, it doesn’t appear possible to do this, and I can’t circumvent the rollup by just reporting on the tasks within my project directly, because the other axis in my report is not a parameter of the tasks themselves, but rather of the projects.

So far I haven’t found a way around my particular issue, but it seems that allowing rollup fields to be used in reporting would solve it immediately. Is this on the roadmap?