Power button for embedded Bela Mini?

Is there a way to add an external power button (off + on) for the Bela mini, similar to what was discussed here for the Bela: https://forum.bela.io/d/261-suggestions-on-adding-a-power-on-off-switch/18 ? Thanks in advance!

violapwr one followup question - supposed i have 4 embedded mini's that I want to use 1 power switch for. Could I connect the 4 P2.12's to the 1 switch? And if so should all 4 mini's share the same ground?

giuliomoro thanks!