Need to use principal-transformer in aggregate-realm in between authentication-realm and authorization-realm

It is requirement to use principal-transformer in aggregate-realm in between authentication-realm and authorization-realm .
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<security-domain name="TestDomain" default-realm="TestAggRealm" permission-mapper="default-permission-mapper" pre-realm-principal-transformer="test-transformer" security-event-listener="local-audit">
<realm name="TestAggRealm" role-decoder="from-roles-attribute"/>
</security-domain>

.
.

<aggregate-realm name="TestAggRealm" authentication-realm="TestLdapRealm" authorization-realm="Test_Auth_LdapRealm"/>

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I think to achieve this there need to be something like "mid-realm-principal-transformer" in <aggregate-realm> only .