slave url as a parameter?

[BillR]

I want to allocate a slave and have its URL appear as a parameter,
e.g. if it were a script,

    WEBDRIVER_NODE = jenkins.getSlave ubuntu

so that in my job's mvn cmd:

    ... -Dremote=$WEBDRIVER_NODE test

or possibly

    ... -Dremote=http://${WEBDRIVER_NODE}:4444/wd/hub test

It seems this must be possible, but I'm not seeing it in the O'Reilly
Jenkins book.

Thanks,
Bill