Ah ok sorry, I understand better, you don’t want to manage individual presence, you just want to detect like a motion sensor in a building lobby (which activates when you enter, and as soon as there is no more movement after X time, turns off the light)
Indeed, as it stands, this is not possible (it might be possible by tinkering, but in any case, in a simple/clean way, it’s not possible)
There are several feature requests that require this development, this one (after well the title is no longer explicit), and that one:
I think it just lacks time to do the development (spec/dev) 
PRs are welcome.