rewards property
The expected possible rewards for the activity. These rewards may or may not be accessible for an individual player based on their character state, the account state, and even the game's state overall. But it is a useful reference for possible rewards you can earn in the activity. These match up to rewards displayed when you hover over the Activity in the in-game Director, and often refer to Placeholder or "Dummy" items: items that tell you what you can earn in vague terms rather than what you'll specifically be earning (partly because the game doesn't even know what you'll earn specifically until you roll for it at the end)
Implementation
@JsonKey(name:'rewards')
List<DestinyActivityRewardDefinition>? rewards;