Info Switch on/off command and Led Status

Volumio Version: V2.917

Hardware: Raspberry Pi3b
DAC: HIFI-DAC

Hardware: Raspberry Zero W
DAC: HIFI-berry Dac plus

Hardware: Raspberry Zero W
DAC: HIFI-DAC-AMP

I want to install a button to turn back on the raspberry after the shutdown command.
I understand, just mount a temporary switch (normally open) that closes a pin GPIO (configured with the plugin) to ground.
My DAC use this GPIO PIN:

Is possible to set GPIO17 to On and GPIO27 to Shutdown the raspberry?
The possible setting is:
GPIO17 (state on) to ground for restar volumio
GPIO17 (state on) to ground for shutdown volumio
Is Correct?

another question: is it possible to add a status led so that it is clearly visible if the system is active or not?
With the case the LEDs are not seen