If I would have to guess someone might make a mod tool to do that but 4J wouldn't support it because it breaks the terms and conditions
Yeah Mojang has it on the site but its different on the xbox because its techinically modding the game and its against the terms and conditions
I doubt 4JStudios will release anything to allow you to import skins into the game as this will render their skins DLC virtually useless as players can just recreate the skins in the DLC. So I don't see anything like this in the works, or if they do allow support for these skins it will come with a price tag similar to that of the DLC.