Would you want a Child's Play chapter if it meant you wouldn't play as a doll?
A big point of why Chucky hasn't come to DBD is his small stature. Would you like a Child's Play chapter even if it meant you would play as Nica or Tiffany instead?
EDIT: Chucky as a doll would ofc be present as part of the Power. But the main killer would not be a doll.