Range slider with labels and custom values

[JohnOland]

I have a question if it is possible to have a range slider with custom values and other values that can be used for calculation. I want to have the slider as follows:

Values for the user/labels: 70, 75, 80, 85, 90, 95, 100, 105, 110, 115, 120, 125, 130, 135, 140
The values that should be used for calculation should be: 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 3, 3

Help would be much appreciated!