Instant Pot Lamb Meatballs with Creamy Lemon and Feta Orzo

Name: Instant Pot Lamb Meatballs with Creamy Lemon and Feta Orzo
Ingredients: ¼ cup milk; 3 tablespoons panko bread crumbs; 1 small fennel bulb , 2 tablespoons fronds minced, divided, stalks discarded, bulb halved, cored, and chopped fine; 2 teaspoons grated lemon zest , divided; ½ teaspoon table salt , divided; 1 pound ground lamb; 2 teaspoons extra-virgin olive oil; 12 ounces Swiss chard , stems chopped fine, leaves chopped into 1-inch pieces; 2 cups 100 percent whole-wheat orzo; 3 garlic cloves , minced; 2 cups chicken broth; 1¼ cups water; 1 ounce feta cheese , crumbled (¼ cup)