In Perspective, you are able to reference custom properties in expressions by using script like this tag({this.custom.tagPath}). Does Vision have anything similar to this? Or am I forced to reference Root Container.Label13.tagPath?
Not in expressions, no.
However, under the hood, property self-references within a component are handled as relative when cutting/copying/pasting in the designer, for a similar effect.
That works for my purposes, thanks!