This is in the f19-alpha tree at the moment. I've included screenshots
of the jam specific content . There's no real need to build it
yourself, but if you are really curious instructions on how to do it
locally are here .
There's no guarantee when this will go live, but fingers crossed it will
be floated soon and not for F19.
The text and the screenshot I find a little uninspiring, so I really
welcome anyone to contribute a alternate screenshot/text ideas ASAP!
The link to the list of packages is taken from the jam spin page  and
it could probably also do with some cleaning up.