[keycloak-user] external config with servlet deployed as osgi service

Hi, How do I configure external configuration (or any other config resolver) when I deploy a servlet as OSGi service in JBoss Fuse? There is an example in the documents for classic WAR through a parameter in web.xml but  how about for a OSGi service which uses a blueprint.xml descriptor. The docs say that in this case, the web.xml is not needed since everything is configured through blueprint. An example for this case is needed. Thanks, Carlos