Looking at the code, it seems its not implemented.
if (tm.getClass().getName().toLowerCase().contains("jpa")) {
// configure spring for JPA and local transactions
cls = Class.forName("org.drools.container.spring.beans.persistence.DroolsSpringJpaManager");
con = cls.getConstructors()[0];
this.jpm = (PersistenceContextManager) con.newInstance(new Object[] { this.env });
} else {
// configure spring for JPA and distributed transactions
}