Lenovo TAB 3 8 plus (TB8703N) for /e/OS-T 2.9
e-2.9-t-20250402-UNOFFICIAL-TB8703N.zip
https://sourceforge.net/projects/eosbuildsronnz98/files/OtherSmartphones/e-2.9-t-20250402-UNOFFICIAL-TB8703N.zip/download
Please see sources and install instructions including recovery here:
https://xdaforums.com/t/rom-unofficial-treble-13-tb8703n-x-r-lineageos-20-0-for-lenovo-tab-3-8-plus.4674665/
Use it at your own risk!
Please support the developer(s)!