I got three jams and the white chocolate from this brand.
EDIT: In the end, I added liquid stevia to all the jams and they became much tastier.

--- Choko White - White Chocolate
Very tasty, but be careful because it has 8% net carbs BUT it also has maltitol, which is half net carb. It doesn't say what percentage, but since it's the first ingredient, it's in the highest quantity, so yes, it's for a lower-carb diet, but in moderation because it's very easily not ketogenic. It has a taste of nuts, grains, and white chocolate. Either way, it's quite tasty and at this price, I can't find another option.
Be careful, if you eat a lot it causes bloating, like almost all jams or spreads that have polyol sweeteners.
It has slightly increased carbs and quite a few calories, so be careful.

Energy - 2019kJ / 488 kcal
Fat - 36g
Carbohydrates - Sugar 8g
Carbohydrates - Polyols 51g
Fiber - 0g
Protein - 2.9g
Salt - 0.21g
-------------------------

--- Blueberry
(Edit: 4/5 as I bought it, 5/5 with added liquid stevia)
Blueberries are not sweet as fruits and you can't even eat them straight from the plant, they're bitter and need processing to sweeten a bit. Of all the blueberry jams I've eaten, the taste was relatively mild and not very sweet. Same here, it has whole blueberries in a watery base. I would have liked it a bit thicker but it's quite tasty, exactly what I expected from a sugar-free blueberry jam. It has few carbs and very few calories and I would buy it again.

Energy - 133kJ / 32 kcal
Fat - 0g
Carbohydrates - Sugar 4.7g
Carbohydrates - Polyols 19g
Fiber - 1.8g
Protein - 0g
Salt - 0g
--------------------------

--- Raspberry
(Edit: 3/5 as I bought it, 5/5 with added liquid stevia)
Here I had higher expectations as raspberry is one of the tastiest and sweetest berries on its own. Very thin and almost no sweetness. It tastes more synthetic than jam. Nevertheless, the calories are so low that it might be worth it for someone on a strict diet. I don't know if I would buy it again just for the taste.

Energy - 115kJ / 27 kcal
Fat - 0g
Carbohydrates - Sugar 4.4g
Carbohydrates - Polyols 19.3g
Fiber - 1.7g
Protein - 0.7g
Salt - 0g
---------------------

--- Cherry
(Edit: 3/5 as I bought it, 5/5 with added liquid stevia)
Same as Raspberry, thin and not so sweet but slightly better in taste, that is, I prefer it over that one. It has low calories but quite a bit of sugar.

Energy - 157kJ / 37 kcal
Fat - 0g
Carbohydrates - Sugar 7.5g
Carbohydrates - Polyols 14g
Fiber - 0.9g
Protein - 0.5g
Salt - 0g
-------------------------

I am also attaching photos with the composition of each jam, which should normally be present in every edible product. All foods should also be required to list in the "characteristics" section everything that is stated on the nutritional value label.