We are actively adding subscription types to EventSub; we’ve added 14 so far this year for features like Raids, Polls, and Predictions. As we bring features to Helix we also look at whether it makes sense to bring them to EventSub, too.
We do not have immediate plans to add EventSub subscription types for Emotes. It is possible that these subscription types could happen in the future. If you have a cool use case, we’d love to hear about it in UserVoice!