Hey.
I found a cool mod on gta5mods through to which our character’s hair naturally grows on the head and chin, which is great feature to RP servers 
https://www.gta5-mods.com/scripts/dynamic-hair-growth
It would be cool if somebody will convert this mod to Fivem 
You just linked a vehicle addon.
Either way, you can do both by following tutorials that you can find in #development:tutorials.
Whoops. Wrong link. Now it’s good one. 
Browsing the source code, this seems to only work for the 3 main characters, Trevor, Micheal and Franklin.