すみません、この唐揚げを温めてもらえますか？ — Excuse me, could you warm up this fried chicken for me? (Convenience · Store, Formal — to staff, JLPT N5)

Gesture & etiquette

Hand the item to the staff at the counter.

While most items can be warmed, very specific items might not be suitable (e.g., something that needs frying). Usually, if it's in the chilled prepared food section, it's fine.