Place the wooden skewers in a baking dish filled with water to soak, so they don't disintegrate on the grill. Pour the pineapple juice, honey, Sriracha, garlic powder, and 1/2 teaspoon salt in a small sauce pot. Bring to a boil, then lower the heat to medium and simmer for approximately 25 minutes, to reduce.
Meanwhile, chop the chicken and fresh pineapple into 1-inch chunks. Then cut the bell peppers in half, remove the seeds, and cut into 1-inch pieces. Preheat the grill to medium heat.
Once the wooden skewers have soaked for at least 20 minutes, poke chicken chunks, pineapple and bell pepper pieces onto the skewers, leaving room to hold the skewers on the end. Salt and pepper liberally on all sides.
Place the skewers on the grill for 2-3 minutes. Rotate, then brush with the sriracha glaze and grill another 2-3 minutes. Rotate once more, then brush with glaze again, and grill another 2-3 minutes until the chicken is cooked through. Remove from the heat and serve warm!