From here, here and here.

To install Google service framework and Google play store, you need to install some apk files. Go to “APKMirror“, search the following keywords and download the 3 apk files for your Android device.

1. “Google Service Framework”

2. “Google Play Services”

3. “Google Play Store”

For each apk, there are multiple versions for different “Architecture/Minimum Version/Screen DPI” combinations. Select them by the following priciples:

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{
    "Architecture": ["arm64-v8a", "universal"], // Select one.
    "Minimum Version": "less than or equal to your device's android version",
    "Screen DPI": "nodpi"
}