In June, at the (virtual) Worldwide Developer Conference, Apple announced that developers would be able to offer Family Sharing for their in-app purchases and subscriptions. Now you can.
Previously, Family Sharing allowed you to share purchases you’ve made using your Apple ID through iCloud Family Sharing, which includes apps, music, movies, and an Apple Music subscription. Now in-app purchase sharing is available with macOS Big Sur, iOS 14.2, and iPadOS 14.2.
There’s a new toggle is available in Settings > Apple ID > Subscriptions to let users share eligible subscriptions with family members through iCloud Family Sharing. You will also find another new option to disable subscription sharing for a specific app.