Idea Summary
Currently, the color of the tree region icons is driven by a CSS variable --a-treeview-node-icon-color. The problem is that it is fixed for every node in the tree. It would be better if we could pass the CSS color class along with the Icon CSS Class Column:

Use Case
Useful for highlighting specific nodes in the tree. Color stands out more than icons.
Preferred Solution (Optional)
- Provide the Universal Theme Color class along with the icon CSS
- Bonus Feature: It would also be great if we could use Template directives for the Node Label and Tooltip.