Preheat the oven to 350 °F. Lightly spray a loaf pan with nonstick spray.
Whisk together the flour, the white and brown sugars, baking powder and baking soda in a bowl.
In a second bowl, whisk together the crushed pineapple and juice, coconut milk, egg whites, and coconut extract.
Take 1 to 2 tablespoons of the flour mixture and toss with the chopped jackfruit (this prevents the jackfruit from sinking to the bottom)
Pour the wet ingredients into the flour mixture, and stir until just combined.
Stir in the flour-coated jackfruit and ¼ cup of shredded coconut
Pour the batter into the prepared loaf pan
In a small bowl, stir together 2 tablespoons of shredded coconut and 2 teaspoons of sugar. Sprinkle evenly over the top of the batter.
Put it in the oven for about 60 minutes, or until a wooden skewer or knife inserted into the center comes out clean.
Transfer to a cooling rack, and give it 15 minutes to cool before slicing it.