If you don’t want to add sugar to a pot of marinara sauce but the tomatoes are a bit acidic, add a little baking soda. Simply stir 1/4 to 1/2 teaspoon into the pot and cook for a few minutes to take the bite out of the flavor.
https://www.tasteofhome.com/article/culinary-school-cooking-tips/
Add baking soda to tomato sauce.
The Purple Almond Kitchen 