Chiesa was not underated in Juventus. He stepped up to a higher in his career after a successful journey with Italy in Euro 2020. However, unfortunately for him that he got a serious injury after that Euro. Therefore, he missed the past season and in this one, he has still been on bench. I believe Maximiliano Allegri does know that Chiesa is a good player for Juventus. He only wants to give Chiesa a little more time to fully recover by that the player can contribute better for Juventus in long run.
It will be a good time for Chiesa and also for Pogba, this month, while the World Cup lasts, they will be able to fully recover, return to full training with the team. For Juventus, this will be a significant strengthening of the midline. I dont know if they can compete with Napoli, it will already depend not only on Juventus, but the theoretical chances remain.