Pan-Grilled Pork Chops with Grilled Pineapple Salsa

boneless center-cut loin pork chops (about 1/2 inch thick)

plus 2 teaspoons fresh lime juice, divided

(1/2-inch-thick) slices pineapple

medium red onion, cut into 1/2-inch-thick slices

minced jalapeño pepper

salt, divided

freshly ground black pepper