Season chops generously on both sides with salt and pepper. In a zip-top bag, combine garlic, olive oil, and herbs; then add chops and seal. Let chops marinate at least 30 minutes, up to overnight.
Heat grill to medium-high. Arrange lamb on grill directly over heat and cook 3–5 minutes on each side for rare or 5–7 minutes for medium-rare. Remove chops from grill and let rest 5 minutes.
Arrange half of herb sprigs on serving platter; lay chops on top and toss with olives. Nestle remaining sprigs between and around chops.