Operator availability - between operator

As between operator accepts 3 inputs ex : c is between a and b.
But our operator just takes 2 inputs a and b. out of which one is fact and one is the actual value to compare against
Is there any way I could solve this?
Should I pass between range in the form of array for ex, if my requirement is
is 7 between 20 and 30. Then a can be 7 and b can be array of 2 numbers which is [20, 30] and I can create a custom operator which is between and that accepts 2 numbers in the number. I this fine or is there any other way in which the between operator can be done.