The new Link Router (https://shortcm.canny.io/changelog/link-router) allows variable, passthrough slugs, but I don't think there are any stats that tell you what it was that was passed through. This would be useful in replacing uniquely generated "personal URLs" by allowing a single link to handle them all, while still having visibility into the stats for each one.

At a base level, this might just be click count, but could be the ability to segment the link to break out all the variable paths passing through it.