NPM1300 with other MCU

I have tested NPM1300-EK with NRF52840DK and  it works. 

However, I am using other MCU with NPM1300 but it is a non -zephyr project.

To work with NPM1300, I have tried using I2C to communicate with it, but I cannot find any information about how to compute the current consumption IBAT .

I found it should use ADCVBAT2RESULTMSB and ADCGP1RESULTLSBS to get the IBAT, but I could not find how to compute the discharge and charging current?

Could you please tell me how to compute the charging/discharging current based on the IBAT value obtained?

In addition, I am not using Zephyr, It seems NPM1300 only supports to use the "fuel gauge" with zephyr project,  what is your suggestion if I want to use it with other MCU 

( I am using TI's CC2652. ), is it possible to use the fuel gauge without zephyr?

Thank you very much

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