It's not like you can't see which chat it's you ain't that blind aren't you?, it's unnecessary thing to be honest, don't worth the effort to apply it, you can talk in it normally like any other chat no need to makes it look like special. Negative.
Are you really suggesting this? Players are paying 350m+ to get a tag color and you want to add something that will make it even more useless. I kinda don't get what's wrong with colors, also you can check the difference between your country chat and the others chat "(CountryCode)Name:"Also as Sinon said it's a public chat so you should not be able to change the way you see it nor edit it's color because players don't get those tags for free and thus I'm negative
I believe being able to change the color of the country code (XX) would be enough so you can still being able to see their job color.