Is there a way to configure Lakka to shutdown after system is idle for specified number of time, let’s say 2 hours with no user input?
Not that I know of, no.
It might be possible using login manager configuration files (logind.conf) by setting IdleAction to poweroff
Please check /storage/.config/logind.conf.d which will allow user override and add at least :
IdleAction=poweroff
IdleActionSec=120min
Restart the service (or reboot)
systemctl restart systemd-logind
To be tested 
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Works very effectively shuts down Lakka regardless if you use it or not 
I think this solution would require RA to register a session in logind and report its idle status. But then it could as well manage everything by itself in the first place (like Kodi does).
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