How to add Border for "P: AABA"

[yoyoshenTW]

Hi Paul,

I am trying to build my system with ABCJS.
And since my sheet is focus on Jazz Lead Sheet.
I would like to make the section more clear.

As i see this online editor .
Your P: test can make a border on SVG display.
If possible, hope you can share how you did it!
Thank you, your project help me a lot!