Simplify processor code with simple throws error - Apache Camel 3.7

[Imran Raza Khan]

I am working on a code in which one processor is like

    public void process(Exchange exchange) throws Exception
    {
        exchange.getIn().setHeader("AMQ_PASSWORD",
exchange.getMessage().getBody(io.fabric8.kubernetes.api.model.Secret.class).getData().get("amq-password"));
    }

I thought to simplify this with following code in route

            ...

.to("kubernetes-secrets:///?kubernetesClient=#kubernetesClient&operation=getSecret")
            .setHeader("amq_pass", simple("
 ${body.getData.get[amq-password]}  "))
                 or
            .setHeader("amq_pass", simple("
 ${bodyAs(io.fabric8.kubernetes.api.model.Secret).getData.get[amq-password]}
 "))
            ...

But all tries leads to following error

    [org.apa.cam.qua.mai.CamelMainRuntime] (Quarkus Main Thread) Failed to
start application: org.apache.camel.FailedToCreateRouteException: Failed to
create route nats-pub at: >>> Set
    Header[nats_user, simple{  ${body.getData.get('amq-password')}  }] <<<
in route: Route(nats-pub)[From[timer://ipc?repeatCount=1&delay=60000] ...
because of No language could be found for: bean