Now also OnePlus 9, OnePlus 9 Pro, Xiaomi Mi A1 and POCO X3 Pro enjoy the official support for LineageOS 19.
OnePlus 9 is not foreign to Android 12 thanks to the update OxygenOS 12 and the numerous personalized Roma. Little X3 Pro obtained Android 12 from its manufacturer through the Miui 13, while Xiaomi Mi A1 has not received updates beyond Android 9 Pie through the official channel.
If you want to try LineageOS on any of these four devices you can download the relative restoration package using the links listed to follow, keeping in mind the Build for POCO X3 Pro has not yet been uploaded at the time of writing.
The official version of LineageOS 19 is not supplied with the pre-installed Google apps, therefore to use Google Apps or services it is necessary to perform the flash of a compatible GAPPS package immediately after installing the ROM.
Finally, remember that these practices are not recommended for those who have little familiarity with modding, since they are not free of risks.
Written by Matteo with love from Italy