I manage a small team of UX designers, and we've been tasked with improving our process and the visibility into the process. I want to be able to add multiple milestones for each issue on our kanban board. For example, UX review, PM review, Final review, and have those milestones show up on either the timeline or calendar view. It would be very clumsy and inelegant, but I'd be willing to create subtasks with dates if that were the only solution. However, Jira does not allow subtasks on either the timeline or calendar views for some reason. Is there a workaround or another method to be able to show due dates? It's also really frustrating that I can't create events to indicate PTO for team members or other types of events that impact availability.