Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32wb0/STM32WB06/RADIO/AGC15_DIG_ENG#0x0
AGC15_DIG_ENG register
Attenuation at IF Level for the AGC step 5
Attenuation at LNA Level for the AGC step 5
Attenuation at Antenna Level for the AGC step 5
https://github.com/modm-io/cmsis-svd-stm32