Instant Pot Sicilian Fish Stew

Name: Instant Pot Sicilian Fish Stew
Ingredients: 2 tablespoons extra-virgin olive oil; 2 onions , chopped fine; 1 teaspoon table salt; ½ teaspoon pepper; 1 teaspoon minced fresh thyme or ¼ teaspoon dried; Pinch red pepper flakes; 4 garlic clove , minced, divided; 1 (28-ounce) can whole peeled tomatoes , drained with juice reserved, chopped coarse; 1 (8-ounce) bottle clam juice; ¼ cup dry white wine; ¼ cup golden raisin; 2 tablespoons capers , rinsed; 1½ pounds skinless swordfish steak , 1 to 1½ inches thick, cut into 1-inch pieces; ¼ cup pine nuts, toasted; ¼ cup minced fresh mint; 1 teaspoon grated orange zest