Send in legacy format

[WeUseBc]

I'm using the c# version 2.2.0 and I need to send a message in the legacy format:

{
    "to": "/topics/topics_",
    "notification": {
        "body": "...",
        "title": "..."
    },
    "data":{
     ...
    },
    "content_available": true
}

Specifically, I need the "content_available": true for our apps to understand the message correctly. However, when using FirebaseAdmin.Messaging.Message() I don't have the possibility of setting this field, the only way is to do:

                    Apns = new ApnsConfig{
                        Aps = new Aps{
                            ContentAvailable = true
                        }
                    },

However, this doesn't work with the setup as it requires the legacy version. Is there any way that I can use the legacy version of a message? Or is it possible to change how the message is encoded into json?

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