Referenced graph nodes color

It would be great if we could specify colors for referenced graph nodes from other graphs in the current graph in Substance Designer.

Currently, referenced graphs are displayed in the same red color (#a21318) as default nodes, which is not very intuitive.

While allowing users to customize the color would be ideal, if it disrupts the consistency of the user experience, it would be better to represent them with a distinct fixed color instead.
For example, a highly saturated red color like #f01c24, similar to the bright green (#86f047) used for sbsar nodes.