I guess the above mentioned guide should help you out. You only need to change 2 things
1- unitygar.arr file (unitypeojectfolder\Assets\GoogleARCore\SDK\Plugins)
2- The apk "tango core"
These both files are provided by the master "TOMTHECARROT" in the repository .
Follow the link below https://developers.google.com/ar/develop/unity/getting-started
I guess the above mentioned guide should help you out. You only need to change 2 things 1- unitygar.arr file (unitypeojectfolder\Assets\GoogleARCore\SDK\Plugins) 2- The apk "tango core"
These both files are provided by the master "TOMTHECARROT" in the repository .