This idea has been merged into another idea. To comment or vote on this idea, please visit WEBFLOW-I-273 Style Pseudo Elements like :after or :nth-child(even/odd).
There are a ton of new features available in CSS that are becoming widely available (like clip-path). The pace of advancement already outstrips this tool (again clip-path). Why not add a direct CSS attribute editor as well as the option to have :before and :after prefixes for different classes? That would allow for things such as pseudo images to do things like add borders to clipped elements.