Preheat a grill. Meanwhile, in a medium skillet, heat 1 tbsp. EVOO over medium-low heat; add the onion and cook until softened, about 5 minutes. Stir in the blueberries, sugar, lemon juice, thyme sprigs and 1/2 tsp. pepper. Simmer until the blueberries have released their juices and the compote has thickened, about 5 minutes. Discard the thyme sprigs and keep the sauce warm.
Brush the pork chops with 2 tbsp. EVOO and season with salt and pepper. Grill, turning once, for 8 to 10 minutes for medium; remove from the grill and let stand.