A Dutch pancake or baby isn't necessarily supposed to be particularly sweet itself. A lot of sweet ones are dusted with powdered sugar after baking, or served with a compote or syrup. For this recipe you could likely add between 1 and 1 1/2 cups of berries, depending on their size. You don't want to add in too many, or the juice they release could make things messy. This recipe is also a good base for a savory version since it doesn't include sugar, suitable for brunch, a light lunch, or supper. If you look on the internet you can find ideas for either a sweet or savory version- and add sugar to suit your own tastes or fruit.
Look around. Here are a bunch of recipes. Sugar ranges from 1 tsp to 2 tbsp Blueberries about 1/2c per 1/2c flour https://www.google.com/search?ei=ZIW4XOLWC4yEtQXLn5OIBQ&q=dutch+pancake+recipe+with+berries&oq=dutch+pancake+recipe+with+berries&gs_l=psy-ab.3..0i22i30.3387.6431..6552...0.0..0.137.1407.6j7......0....1..gws-wiz.......0i71j0.NvYdfb4Wie4
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Here are a bunch of recipes.
Sugar ranges from 1 tsp to 2 tbsp
Blueberries about 1/2c per 1/2c flour
https://www.google.com/search?ei=ZIW4XOLWC4yEtQXLn5OIBQ&q=dutch+pancake+recipe+with+berries&oq=dutch+pancake+recipe+with+berries&gs_l=psy-ab.3..0i22i30.3387.6431..6552...0.0..0.137.1407.6j7......0....1..gws-wiz.......0i71j0.NvYdfb4Wie4