If you need to increase the cooking time, or have skinless/boneless chicken thighs on hand, then you could use those and increase the cooking time to 4-5 hours on low heat.
Recipe adapted from http://www.cinnamonspiceandeverythingnice.com/slow-cooker-shredded-chicken-chili/
Recipe by Whisk Together at https://www.whisktogether.com/2015/04/17/slow-cooker-chicken-nacho-chili/