To make individual chocolate puddings, divide the pudding mixture among six 6-ounce ramekins and cover each with aluminum foil. Insert a steamer rack into your Instant Pot and add 1 1/2 cups water. Lower 3 ramekins onto the rack. Cook on low for 5 minutes. Let the pressure release naturally for 10 minutes. Then release the remaining pressure manually. Using oven mitts, carefully remove the cups and uncover to let the steam to escape. Add another 1/2 cup of water into the Instant Pot. Repeat with the remaining 3 cups. Let the puddings cool to room temperature before refrigerating for 4 hours.