Wonder if spells can be added to magic items if they have charges. Bracers of defense with misty step?

Hmmmm wonder if spells can be added to magic items if they have charges. Bracers of defense with misty step? @mikemearls this sound legal?Like as in making a new item? I think that's a good way to customize an item

— Mike Mearls (@mikemearls) September 1, 2017