Absolutely. After you've configured the build fetch destination on the Jazz SCM page you then configure on Ant page the location of the fetched build file. For example:

/home/builds/sandbox (this is the fetch destination in which the files will be loaded from Jazz SCM)

/home/builds/sandbox/releng/build.xml (this is the actual build file, it's store in a project called releng and is in the Jazz repository)

Jean-Michel Lemieux
Jazz Source Control Team