Adafruit Feather nRF52840 Doesn't Support nrfx Framework

Hello,

I’ve got one of the Adafruit Feather express nRF52840 boards, and I’m developing a project on it, but I haven’t used platformio before. I wanted to understand why I can’t use the nrfx framework with this board, it doesn’t appear to be supported? Is that something I could work on adding? Also what is the proper way to import the nrfx files into a platformio project using the Arduino framework?

Any assistance with this is greatly appreciated.

https://docs.platformio.org/en/stable/boards/nordicnrf52/adafruit_feather_nrf52840.html#frameworks