Sonoff 4CH Pro R2 reed switch to detect door open

Hi there

I’ve setup a Sonoff 4CH Pro R2 with Tasmota to control two garage doors and 2 garage lights, all is working perfectly but I wanted to connect 2 reed switches to each door to detect when they are open but cannot seem to find information on the GPIO pinouts on this model.

Has someone setup something similar or know of a way or workaround to detect that the doors are open or closed?

Thanks in advance…