External Interrupt handlers and interrupt priorities during porting from STM32 to nRF52832

Can any of you point me to the source code snippets for external interrupt handlers with priorities when porting from STM32 to nRF52832. I looked into:-

But the priorities are missing for DECARSTIRQ (P0.24), DECAIRQ (P0.19). Also could not get the external interrupt lines mapping.
Thanks & regards
Sandeep Suresh.