It's a simple example, maybe too simple to get the point. What I want is to conditionally set things on a yaml file. If you have ever used a templating language, you know this problem

    services:
        redis:
            ...
    
        {{ if some_condition }}
            volumes:
                bla bla
        {{ end if }}
    
        {{ if some_other_condition }}
        another_service:
            ...
        {{ end if }}
    
    volumes:
        {{ for volume in volumes }}
            - ...
        {{ end for }}