Assign different values for scale rating for reverse scoring

Edit: I found a temporary way, but it works only for reverse scoring, for example if your 3 fields scoring from 1 to 7, and the second question is reverse scored, you will calculate like that

field_1 + (8-field_2) +field_3

here you the field 2 is reverse scored, you can do this to any range like if it is from 1 to 5 scale you will subtract the reversed questions from 6 and so on. Also, you should notice that in usual the calculation field will start from zero and then increase in values as the user answers questions, but in the above example it will start from 8, so user must answer all reversed questions in order not to disturb the calculation process, this would not be an issue if developers allowed assigning different values to scale rating and it would be helpful if they allowed calculations to other fields like matrix, too.

I want to assign values to scale rating as some questions will be score reversed meaning best will take 1 and worst will take, but I cannot specify values for scale rating