Default [Q] View Nexus 7 on a Vertically (portrait) mounted TV

I have a rooted Nexus 7 2013. I would like to use it to view an app in portrait mode. But portrait mode in the Nexus 7 is letter boxed in the 1080p tv.

I was able to do full screen landscape using 'wm command' as well as through google market apps.

Is there a rom for the Nexus 7 that can do this ?

Or better yet, is this a matter of changing a configuration file ?