Amazon dynamodb 在dynamodb中更新列表

如何在dynamodb中更新列表。考虑下面的例子

Section:"A",
Group:[{Name:"Albert",
  Age:24},
  {Name:"Antony",
    Age:25}],
GroupName:"Ply"

现在我需要将阿尔伯茨的年龄从24更改为26，将部分作为我的主要分区键

 var params = {
 TableName: "Add_list",
 Key:{
 Section:"A"
  },
 "UpdateExpression" : "#Key = :value",
  "ConditionExpression":"#Key1 = :value1",
 "ExpressionAttributeNames" : {
 "#Key" : "Group",
 "#Key1":"Group[0].Name"
 },
 "ExpressionAttributeValues" : {
 ":value" : [{Name:"Albert",Age:26}],
 ":value1" : "Albert"
  }
  };