Send a message with spring cloud to different consumers with a custom RoutingFunction

As per spring doc -> https://docs.spring.io/spring-cloud-function/reference/spring-cloud-function/programming-model.html#messageroutingcallback

Using functionRouter defined in my application-test.yml I was able to consume a message from a topic and to route via MessageRoutingCallBack to two different beans filtering by the value of a header:

application-test.yml

spring:  cloud:    function.definition: functionRouter    stream:      function.routing.enabled: true      bindings:        functionRouter-in-0:          content-type: application/json          destination: ${CLOUD_TOPIC:Example.Input}          group: ${CLOUD_STREAM_BINDINGS_INPUT_GROUPID:getExampleConsumerGroup}

MessageRoutingConfig.java

@Configuration@Slf4jpublic class MessageRoutingConfig {    private static final Map<String, String> routingFunctions =            Map.of( "CONS_A", "consumerA","CONS_B", "consumerB");    @Bean    public MessageRoutingCallback routingCallback() {        return new MessageRoutingCallback() {            @Override            public String routingResult(Message<?> message) {                String messageType = (String) message.getHeaders().get(KAFKA_HEADER_MSG_TYPE);                return routingFunctions.get(messageType);            }        };    }}

Again from documentation -> https://docs.spring.io/spring-cloud-function/reference/spring-cloud-function/programming-model.html#multiple-routersit is then explained how to create custom RoutingFunction but no examples are given on how to then invoke it in order to have the message consumed by consumerA or consumerB.

Below is my current implementation taken as an example from the spring documentation and adapted.

application-test.yml

spring:  cloud:    function.definition: functionRouter;mySpecialRouter    stream:      function.routing.enabled: true      bindings:        functionRouter-in-0:          content-type: application/json          destination: ${CLOUD_TOPIC:Example.Input}          group: ${CLOUD_STREAM_BINDINGS_INPUT_GROUPID:getExampleConsumerGroup}        mySpecialRouter-in-0:          content-type: application/json          destination: ${CLOUD_TOPIC_NEW:Example.Input2}          group: ${CLOUD_STREAM_BINDINGS_INPUT_GROUPID:getExampleConsumerGroup}

MultipleRouterConfiguration.java

@Configurationpublic class MultipleRouterConfiguration2 {    @Bean    RoutingFunction mySpecialRouter(            FunctionCatalog functionCatalog,            BeanFactory beanFactory,            @Nullable MessageRoutingCallback routingCallback) {        Map<String, String> propertiesMap = new HashMap<>();        // Implement correctly propertiesMap with definition or routing-expression        return new RoutingFunction(          functionCatalog, propertiesMap, new BeanFactoryResolver(beanFactory), routingCallback);    }}

Is it possible to route the call to consumerA or consumerB using custom RoutingFunction or am I totally off the mark ?