I appreciate that REM accuracy is not high given the complex nature to detect it.
However, I would still very much like to see REM total hours per night and percentages reported/summarized like deep sleep.
It would at least help to compare and see trends.
Other apps appear to do this as well. Even if not accurate/indicative only and accordingly labelled, it helps to see if REM sleep has increased or decreased over a period of time. This added feature/ extension would help to see how changes (in lifestyle, environment etc.) affect REM. Also gives an indication how the mental capacity and memory for the day ahead might compare to previous nights.
Would be great if you also collect this in your anonymous database (for those who opt in) to compare an individual daily total REM time to a larger population (which uses the same algorithm, perfect or not).