LineageOS is a free, community built, aftermarket firmware distribution of Android 11, which is designed to increase performance and reliability over stock Android for your device. LineageOS is based on the Android Open Source Project with extra...
Read the latest post on page 5 for installation instructions. If you want Android 10 they do have a LineageOS 17.1 as well.
i have the aosp gsi for 12, thats as close to vanilla you can get without a pixel phone lol. it comes up in developer options for me on gsi treble roms. i domt know if oos brings them up. they dont work as dsu images, but i flashed one like any other gsi, low and behold it worked great for the few hours i had it installed