How to let Volumio play an internet streaming?

I am wondering if it there is a simple way to let Volumio play an audio file available somewhere (internet), when we know the address (for example http://somewhere.on.thenet/myfile.mp3)?
I understand I can create a file in the WEBRADIO directory, but I mean here a file for extemporary listening (suppose I am browsing the internet and find an audio-address, and I want to play it in RPI instead of on the tablet).
Or should this be appended to the tail of the whislist?

It would be very nice if we could add our own streams via the web interface. I wish the developers add it in the future!