Prepare the mold. Set it aside (see Note 1).
Combine the konnyaku powder and sugar in a small bowl. Mix until both are well combined (see Note 2). Set aside.
Drain the nata de coco. Discard the syrup and set the fruit aside.
Drain the pineapple syrup from the can into a measuring cup. Add water to the syrup until it reaches 950ml (see Note 3). Pour the measured liquid into a medium sized pot.
Add the sugar-jelly powder into the pot and cook it until the sugar and jelly is all dissolved and reaches a rolling boil. This should take approximately 10 minutes over low heat. Turn off the heat (see Note 4).
To assemble the nata jelly, arrange a layer of pineapple cubes and nata de coco at the bottom of the tin. Spoon a layer of jelly into the bundt tin until the fruits are about two-thirds submerged in the jelly (see Note 5).
Let the jelly set, for about 3 to 4 minutes. To speed up the setting process, place the bundt tin in a larger tray filled with cold water.
Once the first layer of the nata jelly is set, pour the second layer of jelly and arrange another row of pineapple cubes and nata de coco on the jelly layer as it cools down (should still be liquid so that you can press the fruits in slightly. Let the jelly set again.
Spoon on the final layer of jelly into the mold. Transfer the mold into the refrigerator and let the jelly set completely (for about 4 hours) before serving.
Turn the jelly out onto a serving plate. Add more pineapple cubes and nata de coco in the center if you wish.