Does the portent feature can replace a roll on a inititative check?

@JeremyECrawford Does the portent feature can replace a roll on a inititative check?

— Aitor Hernández (@AitorHernandezL) August 9, 2016

Initiative is a Dex. check, an ability check. Portent can affect ability checks, so it can affect initiative. #DnD https://t.co/oI1DkqPi56

— Jeremy Crawford (@JeremyECrawford) August 10, 2016