How do you gradually increase and decrease the pitch of a single track in Garageband 10.3.2?

If you add a Pitch Shifter plug-in to the audio track, you can change the pitch shift along the track using the automation curves.

I am usually adding an audio file to the loop browser to change its pitch. The loop can by cut into regions and then I can transpose the regions individually like any loops to lower or raise the pitch.