Preheat your oven to 400°F (200°C).
In a large bowl, whisk together the pineapple juice, soy sauce, brown sugar, jerk seasoning, olive oil, garlic powder, onion powder, black pepper, salt, and cayenne pepper until well combined.
Add the chicken thighs to the marinade, ensuring they are fully coated. Cover and refrigerate for at least 1 hour, or preferably overnight for maximum flavor.
In a large baking dish, arrange the marinated chicken thighs skin-side up. Pour any remaining marinade over the chicken. Scatter the fresh pineapple chunks around the chicken.
Bake in the preheated oven for 35-45 minutes, or until the chicken is cooked through and reaches an internal temperature of 165°F (75°C). Baste the chicken with the pan juices halfway through cooking for extra flavor.
Once done, remove from the oven and let it rest for 5 minutes. Garnish with chopped green onions before serving.