There are a few different ways to install the Google Play Store on a Huawei Nova 7i. The easiest way is to use the Huawei AppGallery, which is Huawei's official app store. To do this, simply open the AppGallery and search for "Google Play Store." Once you find the app, tap on "Install" and follow the on-screen instructions.
If you can't find the Google Play Store in the AppGallery, you can try downloading it from a third-party site like APKMirror.com. Once you've downloaded the APK file, tap on it and follow the on-screen instructions to install the app.
Another way to install the Google Play Store on your Huawei Nova 7i is by using the HiSuite tool. HiSuite is a program that allows you to transfer data between your phone and your computer. To use it, you'll need to download and install the HiSuite tool on your computer. Once it's installed, connect your phone to your computer using a USB cable, then open the HiSuite tool. In the HiSuite tool, select the "Tools" tab and click on "Install Google Play Store." Follow the on-screen instructions to complete the installation.