most modules originally have been designed for M5Stack and before M5Core2 was available. And between M5Stack and M5Core2 a few pins on the bus have changed. I've put together a comparison sheet which might help.

That said this example should give you a starting point.

You will need to modify at least the following lines to make it work with M5Core2:

//#include <M5Stack.h>
#include <M5Core2.h>
...
//#define MISO 19
#define MISO 38
...
//  M5.Power.begin();

Happy Stacking!
Felix