The ginger extract is in the "less than 2% of" category. I found this:
"They do buy actual ginger, but then what they do is they boil it in ethanol, and that essentially destroys any nutritional or medicinal benefits," Mark Canofari said, adding that Canada Dry uses a ginger concentrate. "One drop fills 70 cans [...] and a drop is .05 ml. So that's how little, even of the concentrate, is actually in one drink."
https://www.foodandwine.com/news/ginger-ale-canada-dry-medic...
My go to brand, Seagram’s, contains “natural flavors”. Content and concentration unspecified.