How to Add Additional Servo to DonkeyCar

I’m trying to find a way trigger a servo by making a button on the web interface.

The issue I’m having is that there are a few layers of files that include Python and Javascript, and it’s taking me a lot of time to line everything up. Especially since I’m using Javascript for the first time

Can anyone provide direction?

making a button should be simple but making everything what happens when I press it is another story.

also is there a graphical editor that folks used to design the web interface?