01 - In a mixing bowl, whisk together the olive oil, lime juice, ground cumin, smoked paprika, salt, and pepper. Add the chicken breasts and turn to coat evenly. Cover and let marinate for at least 15 minutes at room temperature or refrigerate for up to 2 hours.
02 - In a medium bowl, combine the diced pineapple, diced mango, finely chopped red onion, diced red bell pepper, chopped cilantro, minced jalapeño (if using), lime juice, and a pinch of salt. Toss gently to combine, then cover and refrigerate while preparing the remaining components.
03 - Rinse the jasmine rice under cold running water until the water runs clear. In a saucepan, bring the coconut milk, water, and salt to a boil over medium-high heat. Stir in the rinsed rice, reduce the heat to low, cover tightly, and simmer for 15 minutes or until the liquid is fully absorbed. Remove from heat and let stand, covered, for 5 minutes. Fluff with a fork before serving.
04 - Preheat a grill or grill pan to medium-high heat and lightly oil the grates. Remove the chicken from the marinade, allowing excess to drip off. Grill the chicken breasts for 5 to 7 minutes per side, or until the internal temperature reaches 165°F and juices run clear. Transfer to a cutting board and rest for 5 minutes before slicing against the grain.
05 - Divide the coconut rice among four plates. Fan the sliced chicken over the rice and spoon the pineapple-mango salsa generously over the top. Garnish each plate with a lime wedge and a sprig of fresh cilantro. Serve immediately.