You will never find a low carb grain inclusive food sorry to say. See if you can be referred out to a vet nutritionalist to help formulate a low carb low fat homemade either raw or cooked diet. Kibbles HAVE to have a lot of carb to hold them together. Even the highest meat content in a kibble will still have ~30% carb. Might look into canned food options as well but again they will not be grain inclusive if they are low sugar carb fat etc. the closest I can think of are weruva and tiki dog. Usually dog foods that are in shreds of clearly chicken meat are going to be the lowest carb and lowest fat because they are basically just shredded muscle meat.
