Basically what you need to do is find a spot at the bottom character where you want to start the zoom using the zoom helper and paste that into your script. Then you pick another spot along the same y-axis at the top of your character where you want the zoom to end and place that in your script with how fast you want the zoom to happen.
Example: (These aren’t the actual numbers.)
@zoom on 15 125 to 200% in 0
@zoom on 225 125 to 200% in 5
This would move straight up the character at the same zoom percent in 5 seconds.