Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/STMicroelectronics/STM32F301/ADC/OFR4#0x0
ADC offset register4
Data offset 4 for the channel programmed into bits OFFSET4_CH
Channel selection for the Data offset 4
Offset 4 Enable
https://github.com/cmsis-svd/cmsis-svd-data