Yes, Android 14 builds exist for the A8 2018. However, be warned: Maintainers are few. Android 14 builds may have broken Bluetooth calling or camera issues. If you need a reliable phone, stick to Android 13 builds (LineageOS 20) which have been polished for over a year.
The Galaxy A8 development scene, while niche, is fiercely loyal. The phone’s codename is jackpotlte. Here are the current heavy hitters: galaxy a8 2018 custom rom
A word of caution: Android 15 (AOSP) builds exist, but they are experimental. Stick to Android 14 for daily use. Yes, Android 14 builds exist for the A8 2018
One last note for the ambitious: The Galaxy A8 2018 shipped with Android 8.0 Oreo, which means it supports Project Treble. You can actually flash Generic System Images (GSIs) from TrebleDroid or PHHusson. This allows you to run Android 14 GSIs that are maintained for hundreds of devices simultaneously. A word of caution: Android 15 (AOSP) builds
If dedicated A8 ROMs die out, GSIs are your lifeline. Look for "ARM64 AB" GSIs.