Translate this camel route snippet from Java DSL to Blueprint xml

Does anyone know how to write this camel route snippet in blueprint xml's sytax?

.setHeader("headerName").method(beanInstance, "methodToGetHeaderValue")

I assume it's something like this but I can't get the exact syntax down.

<setHeader headerName="theHeader"> 
    <bean id="beanId" ref="MyBean" method="BeanMethod"/> 
</setHeader>

Thanks!