Timed Low-Power Wake on external usb-c power source

Regarding the now activated Timed Low-Power Wake. We have the battery attached and are looking to power up/down the device based on an external usb-c power supply. Would this now be possible to setup. We fiddled around with it for a bit, but haven’t been able to get this use case up and running.

The Tachyon is being used as a relay bridge for odb2 data in our car fleet. Currently the battery is keeping the device powered on after the car powers down as long as the given battery lasts to push data upstream. Preferably we put the device to sleep after data streaming is done and wake it up again when the car starts.