Heat an air fryer to 380ºF for 10 minutes. Meanwhile, prepare the following: Cut 1/2 small lemon in half again to create 2 quarters and remove any visible seeds. Cut 1 of the large rosemary sprigs in half crosswise. Place 1 teaspoon kosher salt, 3/4 teaspoon poultry seasoning, 3/4 teaspoon garlic powder, 3/4 teaspoon onion powder, 3/4 teaspoon paprika, 1/2 teaspoon black pepper, and 1/4 teaspoon granulated sugar in a small bowl and stir to combine.