"So, drinking is a sacrament to Y'ffre... because it's his way of reminding us not to take things too seriously... You know how the other Elves are. Altmer have their crystal towers, and that's how they want to be — cold and perfect. And Dunmer are just like their Red Mountain — smouldering and dark. We just want to have a drink and not worry about it."
Addons cannot get that information without looking at the character with your crosshair (unless you are grouped with the players).
And afaik we cannot even change the texts at the "nameplates" (text above NPCs and players), only the font and size maybe.