Hollow out the watermelon. Make a fruit salad or smoothie out of the pulp, for example.
Mix the jelly, gelatine and sugar and stir in a saucepan with the water. Let it soak for 10 minutes. Heat the mixture while stirring until everything has dissolved. Not cook.
Place the melon peel on a small bowl so that it stands firmly and straight. Carefully pour in the liquid. Then put the melon and bowl in the refrigerator and let it set overnight.
Use a long wooden skewer to poke holes of different depths into the jelly and press the chocolate chips into them. Cut the melon into wedges with a long, sharp knife and serve.