To send a message from FCM backend, we have this view :

I wanna to get the message label (libellé du message) from RemoteMessage. When I debug for the field, the content in the message is labeled as google.c.a.c_l, which I think is an internal field.

First, I just wonder the same as your question. But after read the document here and played around with it, I found that:
remoteMessage.getNotification().getBody() for notification's message body (from Message text/Texte du message), remoteMessage.getNotification().getTitle() for notitifcation's title (from Advanced options), remoteMessage.getData() for data payload (from Advanced options).Try to get it with remoteMessage.getNotification().getTitle(). However, check before if remoteMessage.getNotification() != null.
Hope this helps.
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