Access to Power Data in Apps

If I look in the Sensor Toybox, it shows that I can access data for altitude, cadence, heading, heart rate, pressure, speed, and temperature, but not Power.

The Activity Toybox shows access to Current Power.

However, page 30 of the Monkey C Programmers Guide shows that the "App" App type doesn't use the Activity Toybox.

Is there a way to use Power Data inside an "App" App type?

Will the Sensor Toybox use the sensors that are already paired in the Bike mode of the watch or do the sensors need to be paired separately in the App?