Is there any way to place a user script at the bottom of the automatically placed JavaScript?
I want to place the custom code under /body.
Not from within the Bootstrap Studio App. You would have to do it after you've exported your file as HTML. It may be possible to do it with an export script. I don't use them, so maybe someone else can chime in on that.
I have previously suggested to the devs that they should give us the options to add custom code not just to the head section, but also before the HTML, and after the HTML.