And here is a way to do this in the JBoss Fuse blueprint.xml configuration
<bean id="mbeanRegistrer" class="org.apache.karaf.management.MBeanRegistrer" init-method="init">
<property name="bundleContext" ref="blueprintBundleContext"/>
<property name="mbeans">
<map>
<entry value="com.mycompany.myservice:type=admin,name=myadminBean" key-ref="myadminBean"/>
</map>
</property>
</bean>
Thanks to my colleague Y.H. for help :)