At the moment, I don't believe Lithium is compatible, but are there plans to incorporate it down the line?

please see previous packs.. all the way down to aof3 for ideas on what mods will most likely make it into the next update.

lithium.. has almost always been in the pack.

Lithium isn't in the latest AoF5 pack tho? Am I missing something here?

Or are you saying it will be added down the line as all the prev mods in Aof 4, 3 etc. once updated. At the moment, it conflicts with something and causes a startup crash, hence the question on compatibility.

Lithium was in the pack. It was removed because it was crashing on 1.18.1. It just updated 8 hours ago and will be included in the next update.
https://www.curseforge.com/minecraft/mc-mods/lithium/files/3565566