Dupre Family Chicken and Sausage Gumbo

Name: Dupre Family Chicken and Sausage Gumbo
Ingredients: 7 chicken drumsticks, with skin; 6 bone-in chicken breast halves, with skin; 1 tablespoon Cajun seasoning blend (such as Tony Chachere's®), or to taste; 0.5 cup olive oil; 0.5 cup dry white wine; 4 cups chicken broth; 1 large yellow onion, chopped; 1 large green bell pepper, chopped; 1 large celery stalk, chopped; 3 tablespoons olive oil; 1 cup all-purpose flour; 1 cup canola oil; 10 cups boiling water, divided; 1 teaspoon garlic powder, or to taste; 1 teaspoon cayenne pepper, or to taste; 1.5 pounds smoked sausage, cut into 1/2-inch slices; 2 cups uncooked jasmine rice; 3 cups water; 1 bunch green onions, chopped