I have a question about roles and emojis

So in the Discord API Docs, you can create a POST request to create emojis for a server (https://discordapp.com/developers/docs/resources/emoji#create-guild-emoji) and it says that I can whitelist emojis to certain roles so only people with that role can use the emoji. Why is it that we can't do this in the Emoji section of the Server Settings? It is something with is going to be added? Thanks!