The Ticket entity was unfortunately just not incorporated into the original designs of the Inbox. Which entities can have Notes linked to them is also something that’s hard-wired, so out-of-the-box there isn’t a direct way to get Ticket updates into the Inbox.
I think Gary’s workaround involved the Event Daemon recognizing a Ticket creation/update event, then creating a Note addressed to the Ticket assignee so it shows up in their Inbox.
Getting Ticket data into the Inbox would all be elaborate workarounds right now. I’d recommend submitting your thoughts to our product team via the link earlier up on the thread to let them know more about your use cases.