Combine pudding mix, chai tea latte concentrate, and milk in a 6-quart slow cooker (preferably oval). Stir in bread until all of the pieces are moistened. Scatter granola over the top. Cover and cook on low 4 to 5 hours. If your slow cooker has a warming setting, you can keep the pudding warm several hours; if it doesn't, the pudding will stay warm up to 1 hour with the cooker turned off. Serve cut into squares.