Creating an expected timeline on control chart

[Tate Townsend]

Is it possible to add data to my control chart? I'd like to be able to see a line that represents my "expected" time for a certain task. For example, a project should only stay in drafting for 3 days before moving back to engineering for review. So ideally, I'd be able to click, perhaps in quick filters, to add a line on the control chart, similar to the rolling and regular average lines.