How to turn Fan Shim Fan off on shutdown

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See this thread for more info on this.

Fan Shim Button to turn Pi on and off FYI post

I have a Fan Shim on my Pi 4B. I chose to not install the Daemon and just let the fan run continuously. My temps are consistently right around 40c. Anyway, I use the Fan Shim button to boot my Pi up, and do a proper shutdown. The boot up is easy, by default momentarily grounding GPIO 3 will boot your pi up. Assuming you left it powered after shutting it down. The Fan Shim Button grounds GPIO 3 when, and while pressed. Its listed as Wake in the Pinout To get that same button to do a proper …