Chicken Kelaguen

Name: Chicken Kelaguen
Ingredients: One 4½-lb. chicken, cut into 6 pieces, skin removed; 2 tbsp. extra-virgin olive oil (optional); 1 cup fresh lemon juice; ½ cups finely chopped scallions, plus 1 Tbsp. thinly sliced, for garnish; 4 small red bird’s eye chiles, seeded and minced (1 Tbsp.); 1½–2 cups (6¾–9 oz.) freshly grated or frozen, thawed coconut or substitute dried, grated, unsweetened coconut, plus more to taste; 1 tsp. kosher salt; White rice or CHamorru titiyas, for serving (optional)