Thanks @coldrickjack!
I actually thought of this and attempted to subscribe to other properties not visible in the UI via the api. However, despite my app key having access to every scope possible, I still get a scope error when trying to edit webhooks via api. How were you able to create the subscriptions to other properties? If via api, do you know what scopes are required to access those endpoints?
"message": "The scope needed for this API call isn't available for public use. If you have questions, contact support or post in our developer forum."