Cajun Chicken and Sausage Gumbo

Name: Cajun Chicken and Sausage Gumbo
Ingredients: 2 pounds boneless skinless chicken thighs; 2 1/2 teaspoons Cajun seasoning, divided; 1/2 teaspoon garlic powder; 1 cup vegetable oil, divided; 1 pound smoked andouille sausage, cut in 1 inch pieces; 1 1/3 cups all-purpose flour; 1 large white onion, finely chopped; 1 large green bell pepper, finely chopped; 1 jalapeno pepper, seeded and chopped; 2 stalks celery, finely chopped; 3 cloves garlic, minced; 1 teaspoon kosher salt; 6 cups chicken stock; 2 bay leaves; 1 teaspoon black pepper; 1 Tablespoon Worcestershire sauce; 2 teaspoons hot sauce, or to taste; 2 teaspoons chopped fresh thyme (1/2 teaspoon if using dried); 1 pound sliced okra; Cooked rice for serving; Sliced green onions for serving