Hi there!
From my understanding, you assigned a button common event to make this whole thing, right?
On the plugin parameters, there is a variable value for the jump peak(height). You can change its value on your common event before you jump. Although, that will only work for the player.
For events, you can change the value by script call, listed on the plugin help file.
The script call .jumpForward(distance) is the equivalent one as you are pressing the "1" to make the player jump. So you can just assign whatever button you want for the common event, and let the event handle the jump by using the script calls.