write image to sdcard

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unzip -p lineage-*-rpi4.zip lineage-20.0-20230505-UNOFFICIAL-KonstaKANG-rpi4.img | \
  pv | sudo dd of=/dev/sdc

use gparted to expand data partition

Settings -> System -> Raspberry Pi settings -> SSH / VNC (enable both)

Enable Android debugging & Rooted debugging under Settings -> System -> Developer options

Settings -> About tablet -> IP address; copy SSH key then connect:

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adb connect 192.168.X.Y
adb root
adb pull /data/ssh/ssh_host_ed25519_key my_private_key

chmod 600 my_private_key
ssh -i my_private_key root@192.168.0.100

Settings -> System -> Raspberry Pi settings -> Audio device (choose HDMI)

Download Magisk TWRP patch + APK

enable advanced restart options, reboot to recovery (TWRP), install Magisk patch, reboot then install Magisk APK