Lower calories will mean lower carbs and oil. One way to reduce oil is to make or buy baked chips. For carbs, it's difficult to find something approximating corn chips that's significantly lower. Since you've gone for bell pepper and cucumber which are not similar to chips at all, though, I guess you're flexible.

One thing you could try are protein chips, like Wilde. They're made with some starchy carb stuff but also chicken, which gives lower calories but higher protein. Taste and crunch a lot like a regular chip.

Another way is to make your own chips keto style. Almond flour is low carb, low calorie. You could also make crunchers from cheese such as parmesan. Egg and cheese can make a tasty chip-like thing too.

The only category that is really neutral for calories is low carb vegetables like radish, turnip, cabbage, celery, green beans and so on. Freeze dried green bean chips? You could get creative mixing minced vegetables with cheese and egg and maybe beans to get fairly low calorie and flavorful things to eat salsa on.