https://en.wikipedia.org/wiki/Dietary_fiber shows that leafy geens have higher fiber concentration than starchy vetetables, orange vetetables, whole grains, fruits…

However, fiber is still a form of carbohydrate, and listed as carbohydrate in food labels. It’s hard to visualize the presence of starch or sugar in leafy greens. I think their fiber is totally unlike starch or sugar, completely different.