MKR WAN 1310 Storing encrypted OTA keys

Hi, we are building our own LoRA Network and want to store keys encrypted with in the Serial Flash or better yet in one of the slots on the ECC508 crypto chip.

I have viewed the source for MKRWAN.h and MKRWAN_v2.h and do not see where the crypto chip is actually used by that library.

Has anyone done this?