I mean maybe eggs, if allowed to roam and given their shells back. But modern chickens are just absolutely genetically ravaged by centuries of breeding for absurd egg output and massive growth.
Before domestication they’d lay about a dozen a year. Now they lay once a day or so.
That’s likely true, but I also have serious doubts that a chicken completely untouched by human breeding would output like the breeds bred to lay even if given unlimited food. I also doubt their bodies are made for such production.