Alternative to Github repository to get Halium source for Mi A2 Lite?

Hello everyone!

I want to install Ubuntu touch on a Xiaomi Mi A2 Lite phone which has a native Android OS.

I have tried with UBport_installer, but there is not port for this device yet.

Then I have tried to install Halium on the device, but I am stuck at this page:
https://docs.halium.org/en/latest/po...t-sources.html

The "adding device-specific source" mention that a Github source should be found for the device, but for my smartphone, it doesn't exist.

Do you see any alternative for the installation?

Thanks for the help!