REQUEST: power bar for focus unit frame

[geekyadam]

Request to show mana/rage/energy/focus of Focus unit frame.
When tanking I focus the healer to keep an eye on them. It'd be really useful to see their mana in the focus frame.
Was thinking like maybe literally like a 1 pixel high line across the bottom of the Focus frame. Don't want it to be visually intrusive, just easy to see current level with a quick glance.
Thanks.