Elementor’s global settings allows it to access certain CSS properties dynamically. So, for example, if I had a colour defined in an ACF field somewhere, I would be able to dynamically populate a global colour field which can then be used in all the colour picker fields to style the site.
Same for Global Font sizes.
Currently Elementor’s global styling does not calculate the shades and tints.
It also cannot calculate the various other font sizes from one primary font size.
I am currently working on setting my blueprint up and using your WP plugin to calculate the shades, tints and sizes, and I thought of suggesting this.