FCM数据消息:需要发送JSON数组代替字符串值

{
"message":{
"token":"bk3RNwTe3H0:CI2k_HHwgIpoDKCIZvvDMEFQ3P1...",
"data":{
  "Nick" : "Mario",
  "body" : "great match!",
  "Room" : "PortugalVSDenmark"
}
}
}

但是,我需要以JSON数组的形式发送数据,如下所示:

{
"message":{
"token":"bk3RNwTe3H0:CI2k_HHwgIpoIZvvDMExUdFQ3P1...",
"data":{
       "geofence":[{
                     "Nick" : "Mario",
                     "body" : "great match!",
                    "Room" : "PortugalVSDenmark"
                    },
                    {
                    "Nick" : "Mario",
                    "body" : "great match!",
                    "Room" : "PortugalVSDenmark"
                    }]
}
}
}

如果我尝试在请求正文中发送JSON数组以发送消息,则会出现以下错误:

  {  "error": 
   {    "code": 400,    
"message": "Invalid value at 'message.data[0].value' (Map), Cannot have repeated items ('geofence') within a map.\nInvalid JSON payload received. Unknown name \"\" at 'message.data[0].value': Proto fields must have a name.",    
"status": "INVALID_ARGUMENT",    
"details": [      {        "@type": "type.googleapis.com/google.rpc.BadRequest",        "fieldViolations": [          {            "field": "message.data[0].value",            "description": "Invalid value at 'message.data[0].value' (Map), Cannot have repeated items ('geofence') within a map."          },          {            "field": "message.data[0].value",            "description": "Invalid JSON payload received. Unknown name \"\" at 'message.data[0].value': Proto fields must have a name."          }        ]      }    ]  
}} 

Android代码需要JSON数组格式的数据,而不是字符串格式的数据。我在这里受了重伤。

我们将非常感谢您的帮助。