That will mostly polish out. You could do it by hand with a microfiber and polish compounds. There's enough stone chips in that bumper anyway, I can't believe the van owner would bother with a repair. But props for owning up to it and not just driving away.
Reversed my (blue) car into this van. Oblique angle so more of a scrape then dent.
I'm told the repair quotes are 400 and 350.
I'll need to get a quote or two of my own of course, but does this seem high? Seems high to me.