Chicken Andouille Gumbo

Name: Chicken-Andouille Gumbo
Ingredients: 1 3½–4-lb. chicken; 1 large onion, peeled, quartered; 2 large carrots, peeled, coarsely chopped; 2 celery stalks, coarsely chopped; 2 tablespoons black peppercorns; 1 tablespoon dried basil; 1 tablespoon dried oregano; ½ cup vegetable oil; 1 pound andouille sausage, sliced ¼” thick; ½ cup all-purpose flour; 1 large onion, finely chopped; 1 large green bell pepper, finely chopped; 4 celery stalks, finely chopped; 8 garlic cloves, finely chopped; Kosher salt and freshly ground black pepper; 4 sprigs thyme; 2 bay leaves; 2 tablespoons Louisiana hot sauce; Cooked white rice and sliced scallions (for serving)