LineageOS 19.0 for Raspberry Pi 4 Model B and Pi 400. It is unofficial and unsupported by the LineageOS team. It’s for advanced users only. Pi 4 model with at least 2GB of RAM is required to run this build.
Update: [March 16th] I tried this by myself and got it working just fine on old Pi1 I had lying around and 3.2″ display. I do needed to use Pi3 to get it up and running but after that I just switched to Pi1 and it worked fine enough.
There are some things I would like to be changed. For example the network throughput is B/s which is not most usable in all cases.