Also, if you are considering mods, there’s a grocery store mod by SrslySims. It comes with cc and a lot to place down. (Set as a retail store) It does also change the entire food system, though, but the retail lot is really cool. With it, there’s an option to buy food from a menu by clicking on the freezers in the store. It’s recently been updated as well, though I haven’t used it in a while.
Other than that, placing a grocery stall in the store and hiring a vendor or using a mod to hire one is the only solution I’ve come across.