Spiced Turkey Chili with Spaghetti Squash

Name: Spiced Turkey Chili with Spaghetti Squash
Ingredients: 2 small or 1 large spaghetti squash (3–3 1/2 pounds), halved lengthwise, seeded; 1 1/2 teaspoons (or more) kosher salt, divided; 2 tablespoons extra-virgin olive oil; 1 pound ground turkey; 1/2 teaspoon ground allspice; 1/2 teaspoon ground cinnamon; 1/4 teaspoon cayenne pepper; 3 tablespoons apple cider vinegar; 1 onion, finely chopped, divided; 2 cups low-sodium chicken broth; 1 (14-ounce) can kidney beans, drained, rinsed; 1 (14-ounce) can tomato sauce; 1 tablespoon unsweetened cocoa powder; 1/4 cup chopped parsley; 1/4 cup sliced pitted black olives