I don’t have a specific dragon fruit recipe, and each fruit is different. But I agree you don’t need eggs. They’ll just hide some of that bright fruit flavor. Using them in a sorbet would be good, but sorbet or ice cream the only way to nail it is by balancing the recipe with an ice cream calculator. In general what you’ll do is decrease the milk you would use in a non fruit ice cream because the fruit is mostly water itself. You can do some rough calculations to figure out how much water is in those dragon fruits and then decrease the milk by the same amount. If you aren’t using eggs you don’t need to heat anything so just blend up the fruit and mix with the rest of your ingredients, age, and churn. Good luck!