There is no universal "one-click" installer for all devices due to hardware variances. The installation process typically involves the following steps using ADB (Android Debug Bridge) and Fastboot.
Here is the most reliable way to fix that using a GApps installer. Why You Need a GApps Installer tta pie gapp installer for android 9 upd
To use the TTA Pie GApp Installer on your Android 9 device, follow these steps: Download the APK : Obtain the TTAPieGappInstaller.apk from a reliable source like the Official Developer Link Run the Installer Open the app and tap "Install Android 9" There is no universal "one-click" installer for all
This is where the enters the scene. For users running Android 9 Pie (API level 28), this specialized installer has become a lifeline. Whether you are using an old Samsung, Xiaomi, Motorola, or a generic MediaTek device, this tool promises to seamlessly integrate the Google ecosystem into your Pie-based firmware. Why You Need a GApps Installer To use
How to install google app on Xiaomi China Android 9 Pie 100%