I don’t recommend this, though it can be very educational if you decide that you want to do it once or twice…
I had a roommate in college that was doing aikido with us and he was not content to practice his rolls only on the mat. He would dress in boots, jeans, and a sweatshirt to protect himself a little, then practice his rolls on the sidewalk. Or on the ground. Or through bushes. Or on a brick sidewalk.
I’ve done some of this, and it is certainly not something that you have to do a lot to get some pretty good feedback on the strengths and weaknesses of your ukemi forms. The worst surface I've found is brushed textured concrete or stairs. It also gives you a newfound appreciation of just how much a 1.5” mat absorbs the consequences of wrong ukemi.
I suspect if everyone would do a little bit of concrete ukemi, we’d see less of the ankle-hammering cross-legged landing and the sitting-on-the-top-of-the-foot backfall.