This is what I did. Probably wrong. But I used a short crowbar and popped them out. It takes patience, a bit of force, and you’ll figure out a technique once you get a few out. Broke concrete in places. Cleaned it up and used a small plastic tub of premixed concrete to fill it in with a puddy knife. Used an angle grinder with a diamond cup to smooth it out afterward. It was a process but smooth in the end and pretty cheap to do.