They absolutely do not need to be bent in order to fit the Jmo's. I had the standard 90mm brakes on my Jmo's and they fit fine without bending, or any unwanted contact with ski or sidewall.
The 90mm brakes measure out to be wider than 90mm anyways.
You can make small tweaks to the brake arm just by giving it a tug if you're that concerned. Seriously, it's just a few millimeters though and you'll be fine.