That sounds like a good idea, and a function might allow the user to enter multiple uid and probably help the parser. I’ve raised the GitHub issue.
I think it would be useful to keep the distinction between a filter which always returns a list/array of items and an ID which returns an object?
Also, I like the idea of using a @filter at root - I’ve created a separate thread to discuss thinking behind that (Why differentiate between root and sub-nodes?).