I/O Configuration GPIO

I have a MAX BR1 Mini with the built-in 4GLTE WAN coming from Verizon and a Starlink wired to the LAN3/WAN Ethernet port. I’m trying to figure out if and how I can set up the I/O (GPIO) to output a 12V signal(high) when the cellular signal is either low or disconnected. Not the Starlink signal. In the manual I can only see where you can output a signal if there is no internet/WAN, not one or another. Thank you for the help.

What hardware revision and firmware level is your router. I would like to help confirm it has GPIO output.

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Hardware revision is 3
Firmware is 8.4.1 build 5107

Any ideas on how to make this IO work?