RichText markup in text chat

I’m trying to use Richtext Markup in text chat message however it is not working, is the formatting wrong or is it not supported?
image

local _hexCouleur = couleur and _tohex(Color)
if couleur then
	compileMessage = [[<font color="#]].._hexCouleur..[[">]]
end
compileMessage ..= Message .."</font>"

I think it should be a variable that you will have to manually set by forking the Chat scripts when playing in-game. See: