Add remaining time as an attribute for sensor

[dpyy]

This plugin pretty does exactly what I'm looking for. But one thing that would be useful is to expose the remaining occupancy time for the occupancy sensor. In the default home app you can't see anything beyond on/off but if you use a third party app (like eve) you can already see additional attributes (like delay setting). In there it would be nice to see remaining time.

[dpyy]

Didn't realize its already there