At the time of writing, Microsoft does not officially support running reports in an app on iOS / Android / Windows devices in the Unified Interface (UCI), but as it turns out, it's actually possible to display a report within the app using SiteMap entries pointing to Web Resources.
Reports are just another url in Dynamics and it seems the only reason why is that not working in the app is because every time you click on a item in the reports view it opens it in a new window.