APKXi is an advanced APK installer with split APK support. It also has simple app backup/export functionality.

APKXi can install apps using standard Android API using root access or using Shizuku.

APKXi is an app you can get its from - apkxi.com

Please note that APKXi only installs user-provided files and is not responsible for those apps behavior.
Please also note that some devices/ROMs aren't supported by APKXi that has to do with bad Android API implementation in APKXid ROMs and can't be fixed on app side.