It would be great to have variables for colors and fonts as well included in the variables list. Either automatically generated as you add colors and fonts or by clicking a button in the color and font managers which would then generate the variables?
A custom prefix option per variable group might be good to have too. So you could have --color- for colors and --font-for fonts or whatever you’d want it to be. This would also help prevent conflicts with other plugins that may include CSS variables.