Please take a look at this Devzone case where you can find the steps needed to integrate this sensor. This thread discusses the CH201, which is very similar. Let me know if you are still confused, and I will try to explain in detail.
I don't think there is any driver available for CH101 out of the box in Zephyr; you might need to develop one yourself for this. For integrating a sensor via I2C, I recommend you go through the Developer Academy tutorial, which covers most of the things you are looking for. There are some driver development guides available from Zephyr, but not specifically inside Nordic's tutorials.
