If you’ve never had watermelon jerky before, think of it more like dried mango in terms of flavor and texture.
To make it yourself, thinly slice watermelon, spritz it with a little lemon or lime juice to prevent oxidation, and dehydrate it slowly until it turns into fruit leather. If you want to take things up a notch, dip it in homemade vanilla bean whipped cream.
Take a look at the easy method of dehydrating watermelon here: https://www.brit.co/easy-watermelon-jerky-recipe/