Slow Cooker Chicken and Sausage Gumbo

boneless skinless chicken thighs (cut into 1-inch pieces)

fully cooked smoked sausage (chopped)

stalks celery (chopped)

bell pepper (seeded and chopped)

medium onion (peeled and chopped (1 cup))

(14 to 15 ounces stewed tomatoes, undrained)

chicken broth

instant tapioca

dried thyme leaves

sweet paprika (optional)

frozen cut okra (thawed and drained (2-1/2 cups))

worcestershire sauce

scallions (chopped)

hot cooked brown rice

Hot red pepper sauce (for serving, if desired)