Yes, that's possible:
<?xml version="1.0" encoding="UTF-8"?>
<server>
<mbean code="org.jboss.naming.NamingAlias"
name="org.myapp:alias=myDSAlias">
<attribute name="FromName">aliasJNDIName</attribute>
<attribute name="ToName">java:DefaultDS</attribute>
</mbean>
</server>