[jamesRaybould]

I don't think so, it seems like its just a link to what you can see within the UI anyway and simply pre selects it for you. But I am by no means an expert on it and it is pretty simple to experiment with if you want to give it a try

[ossreality]

People who aren't owners can't normally add labels.

[OJFord]

They presumably still can't via the URL.