I managed to separate the operator and the value like:
But now I have no idea on how to perform the matching. I can not simply modify the excel file lane by lane adding new rows for ALL the possible values because some fields have more than 50 different values... Nor using a concat key because operator can not be interpreted. It should be something dynamic.
Keep in mind that all the fields used in the Excel classification DO exist in my dataset. And the classification output must be Result value.