FHA loan and GFI outlet in bathroom…where to install, dedicated line?

selling house, FHA loan for potential buyer, one of the repair items is to have a GFI outlet in bathroom & kitchen.Kitchen is no problem, plenty of outlets that can accept a GFI. The problem is the bathroom, the only outlet (2 spade) it has is the light fixture on the wall, sink is below light. Does the GFI need own dedicated wire? Can this be joined with the existing light fixture or alongside the light switch on the wall opposite of the light fixture? Does it matter where the new gfi outelt will be? Is it ok 6 feet up? Is it ok alongside light switch (though not that convenient to person using a hair dryer (or whatever)? Location: Minn

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