I am actually studying on how to configure my Arduino Nano Every (and Arduino Nano IOT 33) in order to able to have Firmata Library on them.
I am not a senior developer anyway I found out this: "Boards.h - Hardware Abstraction Layer for Firmata library", but I don't understand if there is a NANO EVERY compatible version on this list on Github:
I have tried on my own with SAM example, at 222 line, but it is not uploading.