Get an option in styles conditions

Idea
1

In the application, I really like to optimize everything and bring it to one template. I set different screen widths (tablet, mobile device) for groups, text, and etc. in styles condition “Current page width <…”. If I set styles and sizes to be applied from <600 px and after that the customer says that he wants not 600px but from 500px to apply styles, I have to manually search and change the numbers everywhere. I was thinking of creating an option set “Screen Sizes” with numeric values and substituting them into the style conditions and then I would have to change only one variable in the option set (global variable). But you can’t “Get an option” sets in styles.