Virtual bike computer / current lap watts

I’d like to see my average watts for the current lap in ERG mode like a “virtual bike computer”. Ideally with the functionality like a real bike computer where I can press lap at any point during a free ride. This would be great to practise manual pacing.
For now, I’d be happy with a display of the average watts in the current interval in a structured workout like it is shown during the FTP tests. It is already implemented, you just have to give us a switch to turn it on. (And no, fumbling around with files in the user profile is not a solution, I want this to work on an iPad for normal human beings)