Chicken and Andouille Sausage Gumbo

Name: Chicken and Andouille Sausage Gumbo
Ingredients: 1.5 pounds andouille sausage, sliced; 4 (5 ounce) boneless, skinless chicken breast halves; 0.5 cup canola oil; 0.75 cup all-purpose flour; 4 stalks celery, sliced; 1 large onion, chopped; 1 medium green bell pepper, chopped; 6 cloves garlic, minced; 2 quarts hot chicken broth; 1 tablespoon Worcestershire sauce; 2 teaspoons Creole seasoning; 1 teaspoon dried thyme; 1 teaspoon red pepper flakes; 2 bay leaves; 6 stalks green onions, sliced; 1 teaspoon gumbo file powder, or to taste; 2 cups hot cooked rice