Expand multiline lists without expanding surrounding expression

[schonstal]

I use dataclass-like event objects in my current project, like so:

    EventBus.notify(node, Events.Explosion.new({
        "direction": direction, 
        "center": global_position,
    }))

I prefer to format them this way universally in my project. The only part of the expression I want to be multiline is the list that I've defined as explicitly multiline with the trailing comma.

However, if I add a trailing comma and run gdformat, it expands the entire function call to the following:

    (
        EventBus
        . notify(
            node,
            (
                Events
                . Explosion
                . new(
                    {
                        "direction": direction,
                        "center": global_position,
                    }
                )
            )
        )
    )

I don't want it to expand the rest of the expression, it's not very readable like this.

Without a trailing comma it will change the code to the following which, while better than the above, is not to my preferences:

    EventBus.notify(node, Events.Explosion.new({"direction": direction, "center": global_position}))

I'd like to be able to configure it to force expansion on the list without expanding the entire line.