Custom character spacing in 'Prepare a form' text boxes - example attached

Preface: I am explicitly referring to the text boxes that are created when in ‘Prepare a form’ and not under ‘Edit”. Also, I apologize for any confusion in asking my question when it comes to correct terminology.

I’ve attached a form that was able to accomplish what I’m trying to do, but I’m curious as to how they were able to do this and how I can replicate it myself without just copy and pasting the field from their form into mine. I am referring to the Vehicle Identification Number text box field, where they’re able to get more space inbetween each character/letter.

Hope this makes sense and thank you in advance.