@felmue thank you for this quick and excellent reply!!! I will do this. Can you just tell me if I need to specify the pins as GPIO33 or 33 in the constructor

I have done several projects with the M5Tough and I really love the device. However I need an SPI connection now on the M5Tough to communicate with a MAX31865 for reading out temperatures from a PT100. This is a real requirement I can not use something else than a PT100!
I always use Arduino code for the M5Tough, how can I configure the pins on the extensions board as (software) SPI pins and have it working with the Adafruit arduino Library?
Can you please get me started/help me out here please?