Slow Cooker Jambalaya

Name: Slow Cooker Jambalaya
Ingredients: 2 cups long-grain white rice; 1/2 medium yellow onion; 1 medium green bell pepper; 2 medium stalks celery; 4 cloves garlic; 3 1/2 cups low-sodium chicken broth, divided; 4 teaspoons Cajun seasoning with salt, divided (or 2 teaspoons salt-free Cajun seasoning plus 2 teaspoons kosher salt); 2 teaspoons Worcestershire sauce; 2 dried bay leaves; 1 teaspoon dried thyme; 1/2 teaspoon freshly ground black pepper; 12 ounces andouille or smoked sausage; 8 ounces boneless, skinless chicken thighs; 2 teaspoons neutral oil, such as canola; 4 medium scallions; Louisiana hot sauce, for serving