Adding regional sports network to PeacockTV subscription via Apple

How do you add a regional sports network to PeacockTV? I have a subscription to PeacockTV via Apple and when I go to add the regional sports here: peacocktv.com/sports/nbcsports-bayarea , it redirects me to my subscription management area on my Apple account. Unfortunately, there's no way to add it here. You can only change your overall plan.