This idea has been merged into another idea. To comment or vote on this idea, please visit WEBFLOW-I-68 Style ::before and ::after psuedo elements in the designer.
This is the main way I handle icons and design elements for lists and oother elements without adding extraneous <img> tags. I wish you could access the before and after pseudo-classes natively. It could be exactly the same UX as how we define the hover, focus, active, etc... classes