This drawn object behaves somewhat like a channel drawing tool. You can use it by clicking this icon:
After you have chosen the tool, you first click on the start of a trend (below, magenta highlight) then the first extreme (green tint) then the reaction extreme (cyan tint). The trio of trendlines extends from there, as shown below with Home Depot. To be clear, these tinted portions don’t show up. They are simply added here to the chart for illustrative purposes.
You can right-click any pitchfork to modify its color, opacity, weight, or pattern. As shown in the dialog box below, you can also preserve any settings as your default.