There is not any more info anywhere. Here's the details:

When you create a new build definition (you can't retrofit existing
definitions), you choose Ant. Next, there will be a wizard page for
Pre-build options. Select Jazz SCM.

Once you finish the wizard, you will have a Jazz SCM page in the definition
editor. Here, you can configure the build workspace, fetch (load)
destination, and related properties. When running builds that use this Jazz
SCM config page, the build engine will fetch the code for you. Also, the
changes and work items are automatically published.

The caveat is that it only supports one build workspace. So, if you have an
advanced scenario where you need to fetch from multiple workspaces, you will
still need to use the teamFetch task inside your build script. You are free
to use a combination of the Jazz SCM page and the teamFetch task.

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Ryan Manwiller
Jazz Team Build