Sorry for the late response, completely overlooked your post..
It's not that simple from what I understand, QNAP builds different chips for controlling the FAN and temperature readouts into their NAS systems, even if it's the same model series.
Best would be to create a GitHub issue over here and we can talk about it there, simply mark me with @ich777 and I will be notified.
Stonyx, the maintainer, over on GitHub is very helpful with this and answers really quickly.
I also contacted @Trunkton because he actually owns a QNAP NAS.