Boruto has a Jougan because his father, Naruto Uzumaki, is a descendant of Hagoromo Otsutsuki, and his mother, Hinata Uzumaki, is a descendant of Hamura Otsutsuki. This gave him Kaguya's chakra and a Jougan (anime only). "Toneri didn't appear in Himawari's dreams and give her a Jougan" isn't the answer I'm looking for, as it is completely wrong. I just want to know why she also didn't get a Jougan as Hagoromo and Hamura's chakra would still mix when she is born, meaning she should have one as well.
Why doesn't she have one? Is it plot hole? Or is a Jougan supposed to be an OP Dojutsu meant for the MC only?