In Wildfly 33 i have this AMQ in Standalone.xml like this:
<subsystem xmlns="urn:jboss:domain:messaging-activemq:16.0">
<server name="default">
<security elytron-domain="ApplicationDomain"/>
<statistics enabled="${wildfly.messaging-activemq.statistics-enabled:${wildfly.statistics-enabled:false}}"/>
<security-setting name="#">
<role name="guest" send="true" consume="true" create-non-durable-queue="true" delete-non-durable-queue="true"/>
</security-setting>
<address-setting name="#" dead-letter-address="jms.queue.DLQ" expiry-address="jms.queue.ExpiryQueue" max-size-bytes="10485760" page-size-bytes="2097152" message-counter-history-day-limit="10"/>
<in-vm-connector name="in-vm" server-id="0">
<param name="buffer-pooling" value="false"/>
</in-vm-connector>
<in-vm-acceptor name="in-vm" server-id="0">
<param name="buffer-pooling" value="false"/>
</in-vm-acceptor>
<jms-queue name="ExpiryQueue" entries="java:/jms/queue/ExpiryQueue"/>
<jms-queue name="DLQ" entries="java:/jms/queue/DLQ"/>
<pooled-connection-factory name="activemq-ra" entries="java:/JmsXA java:jboss/DefaultJMSConnectionFactory" connectors="in-vm" transaction="xa"/>
</server>

I wanted to extend this during boot with a configuration yaml like this:
subsystem:
messaging-activemq:
server:
default:
path:
journal-directory:
path: "/myAbsolute/path/activemq/journal"
relative-to: !undefine
large-messages-directory:
path: "/myAbsolute/path/activemq/largemessages"
paging-directory:
path: "/myAbsolute/path/activemq/paging"
bindings-directory:
path: "/myAbsolute/path/activemq/bindings"

I tried like everything but only got errors. This one in particular:
12:19:35,654 INFO [org.jboss.as.controller.management-deprecated] (Controller Boot Thread) WFLYCTL0028: Attribute 'default-entity-bean-optimistic-locking' in the resource at address '/' is deprecated, and may be removed in a future version. See the attribute description in the output of the read-resource-description operation to learn more about the deprecation.
12:19:35,659 ERROR [org.jboss.as.controller.management-operation] (Controller Boot Thread) WFLYCTL0013: Operation ("add") failed - address: ([
("subsystem" => "messaging-activemq"),
("server" => "default"),
("path" => "journal-directory")
]) - failure description: "WFLYCTL0212: Duplicate resource [
(\"subsystem\" => \"messaging-activemq\"),
(\"server\" => \"default\"),
(\"path\" => \"journal-directory\")
]"
12:19:35,682 FATAL [org.jboss.as.server] (Controller Boot Thread) WFLYSRV0056: Server boot has failed in an unrecoverable manner; exiting. See previous messages for details. - Server configuration file in use: standalone.xml - Minimum feature stability level: community
12:19:35,753 INFO [org.jboss.as] (MSC service thread 1-2) WFLYSRV0050: WildFly 33.0.1.Final (WildFly Core 25.0.1.Final) stopped in 33ms
Drücken Sie eine beliebige Taste . . .

Untill i added the the directory elements to the standalone.xml.
<subsystem xmlns="urn:jboss:domain:messaging-activemq:16.0">
<server name="default">
<security elytron-domain="ApplicationDomain"/>
<statistics enabled="${wildfly.messaging-activemq.statistics-enabled:${wildfly.statistics-enabled:false}}"/>
<journal-directory path="/custom/path/activemq/journal" />
<large-messages-directory path="/custom/path/activemq/largemessages" />
<paging-directory path="/custom/path/activemq/paging" />
<bindings-directory path="/custom/path/activemq/bindings" />

After adding this to the standalone.xml i can now overwrite any of the paths at will through YAML without getting any errors.