Chinese variant of Nokia 6 supports Google services after the July update. The Play Store can be installed, but not everybody knows how to. To overcome the situation, a developer (mauronofrio) at XDA Forums has created the “Nokia 6 utility”.
The utility lets Nokia 6 users to easily install the Google Play Store. Other than that, the utility also changes the system language for the users. So, the whole troublesome process of changing the system language and then installing the Play Store is taken care of by the utility.
Do note that you will still need to enable USB debugging. The utility comes with screenshots to help you guide through the menus and enable the required options for the Nokia 6 utility to work.
Proceed to XDA Developers forums to find the download link and additional information.