You can choose from a list of different conditions. If the element contains a numeric value, you can use e.g. “is/is not equal to, is less/greater than” etc. If the element contains text, you can search based on the number of characters (“is equal to, is less/greater than”) or use “contains/does not contain, starts/ends with” etc. Or simply search products with an “empty” or “not empty” element.