Setting FLAG_INSISTENT for Backround notification.

[tehsunnliu]

Hi, I wanted to know if there is any way I can set FLAG_INSISTENT for the background notifications? I tried to find however, I want unable to find anything about it.
For foreground messages, I'm using flutter_local_notitications and they have an option called additionalFlags where you can set the FLAG_INSISTENT.
My goal is to repeat notification sound like a ringer and show a full-screen intent.
Currently, I'm showing a local full-screen notification from a background message and it does the work, however, I get two notifications created in the system tray, one by flutterfire by default and the other by local notification. If there's any way I can disable the default notification provided by the package also will solve my problem.
Thank you.

[tehsunnliu]

firebase_messaging 8.0.0-dev.14
For anybody who is facing the same problem, I found the solution.
Remove the notification and send only the data part in your message
example:

let message: admin.messaging.Message = {
        token: deviceToken,
        // notification: {
        //     title: "New Order Received",
        //     body: "You have received a new Order.",
        // },
        
        data: {
            type: "order",
            xyz: "Your Data",
           ...
        },

and in your application onBackgroundMessage create a flutter_local_notification.