Hi and welcome!
Have a look at this link. It explains in 60 seconds how to lower you carbs to control your blood glucose.
https://www.dietdoctor.com/low-carb/60-seconds
If you don't want to eat a lot of fat, then don't.
You can eat lots of fresh healthy veg (just not a lot of root veg) and you can eat fruit, just not the very sweet tropical fruits.
But please ensure you eat ENOUGH good quality fat and oil to keep your skin, brain and organs healthy. It is an essential macronutrient.
If you get yourself a blood glucose meter, and start testing your blood glucose before and after food you will very quickly find which foods send your blood glucose high, and which foods keep it nice and low and stable.
The comment about 15 g of sugar in the soup is because all carbs break down to sugars when we digest them. It doesn't matter if they start out as bread, rice, potato, pasta, sweet fruit, or sugar itself. By the time the food has been digested and absorbed into the bloodstream, 15g carbs of which 2.4g is sugar has become 15g of glucose in the blood. The labels are misleading, but our blood glucose meters show us the truth.
Incidentally, sorry to break the bad news, a big apple can be up to 30g of carb, and a medium one is somewhere around 12-15g carbs, so please don't count on it being just 5g
https://www.dietdoctor.com/low-carb/fruits