Instant Pot Braised Chicken with Mushrooms and Tomatoes

Name: Instant Pot Braised Chicken with Mushrooms and Tomatoes
Ingredients: 1 tablespoon extra-virgin olive oil; 1 pound portobello mushroom caps , gills removed, caps halved and sliced ½ inch thick; 1 onion, chopped fine; ¾ teaspoon salt , divided; 4 garlic cloves , minced; 1 tablespoon tomato paste; 1 tablespoon all-purpose flour; 2 teaspoons minced fresh sage; ½ cup dry red wine; 1 (14.5-ounce) can diced tomatoes , drained; 4 (5- to 7-ounce) bone-in chicken thighs , skin removed, trimmed; ¼ teaspoon pepper; 2 tablespoons chopped fresh parsley; Shaved Parmesan cheese