Every time I've asked a CM at the booths about certain ingredients they either ask the chef working or tell me to wait to talk to a manager. I've never been given an ingredient list and I've never seen them refer to a printed list, like you can do at other quick service restaurants.
The item descriptions on the menu boards give only limited information on ingredients. They really only designate GF for gluten free, V for vegan/vegetarian, and K for kid friendly on the boards themselves.