Not that I am aware of. I do not think Polaris was intended as a general use, generic UI framework where having such properties would make sense. Because Polaris is specifically for Shopify internal usage and Shopify app developers, it makes more sense to keep a uniform look and feel, design language system, where icons and their size are part of these constraints.
This section of the design guidelines has more info on that.
|2 hours ago|
|3 hours ago|