https://access.redhat.com/documentation/en/red-hat-jboss-a-mq/7.0-beta/single/using-jboss-a-mq-broker/ currently still states

A tool will be provided to convert the old broker configuration to the new broker configuration.

Dmitrii and me commented on GitHub that the tool is already there, https://github.com/rh-messaging/amq7-documentation-contrib/pull/242 The information probably got lost.