I doubt you can do that. While the jar may only contain a single ejb-jar.xml, the jar itself is the deployment artifact that the container is looking for.
However, you MIGHT be able to do a directory deploy.
So, if you had "xyz.ear" containing your ejb-jar.xml, you may be able to create a "xyz" dir int autodeploy, and place ejb-jar.xml within that directory. That mimics an exploded EAR deploy.
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