Instant Pot Vanilla Jalapeño Corn Chowder

Name: Instant Pot Vanilla Jalapeño Corn Chowder
Ingredients: 4 tablespoons butter (unsalted) (divided); ½ medium sweet onion (about 1 cup, diced small); ½ teaspoon ground black pepper; ½ teaspoon paprika; ¼ teaspoon ground nutmeg; 4 cans whole kernel corn (15.25 ounces each, with juices); 1 can diced jalapeños (4 ounces, medium, drained); ¼ cup turbinado sugar (may substitute granulated sugar); 2 tablespoons vanilla extract; ¾ teaspoons kosher salt (or to taste); 3 tablespoons corn starch; 1 cup heavy whipping cream; 1 can evaporated milk (12 fluid ounces)