400尝试多次循环小部件字段时Terraform代码中出现错误

我收到以下错误错误：

错误：放置仪表板失败：InvalidParameterInput:仪表板主体无效，存在4个验证错误： [ { “数据路径”：“/widgets/0”， “消息”：“应该是对象” }, { “数据路径”：“/widgets/1”， “消息”：“应该是对象” }, { “数据路径”：“/widgets/2”， “消息”：“应该是对象” }, { “数据路径”：“/widgets/3”， “消息”：“应该是对象” } ]

---

状态代码：400，请求id:706ac87c-a796-11e9-8983-65d87c7656b4，代码生成如下所示

{
“小部件”：[
[ //
I have the following code which I am trying to implement for multiple widgets in a single cloud watch dashboard

`    locals {
      instances = csvdecode(file("${path.module}/sample.csv"))
    }

    resource "aws_cloudwatch_dashboard" "main" {
      dashboard_name = "my-dashboard"

      dashboard_body = jsonencode(
     {
       "widgets": [
    for inst in range(length(local.instances)):[  
// i want to repeat the below section as the length of instances variable but getting an error  
           {   
              "type":"metric",
              "x":0,
              "y":0,
              "width":12,
              "height":6, 

              "properties":{

                 "metrics":[ // trying to implement multiple widget in a single dashboard 
    enter code here
                    [
                       "AWS/EC2",
                       "CPUUtilization",
                       "InstanceId",
                       "${local.instances[inst].instance_id}"
                    ]
                 ],
                 "period":300,
                 "stat":"Average",
                 "region":"ap-south-1",
                 "title":"EC2 Instance CPU",
                 "annotations": {
                    "horizontal": [
                          {
                             "label": "Untitled annotation",
                             "value": 1.01
                         }]
                       }          }
           }
      ]]
     })
    }   `