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如何SUM(amount)从refundspostgres中的" "数组中获取聚合json select以下是我的数据模式和结构:

表名: transactions

列名: data

{
  "id": "tran_6ac25129951962e99f28fa488993",
  "amount": 1200,
  "origin_amount": 3900,
  "status": "partial_refunded",
  "description": "Subscription#sub_a67d59efb2bcbf73485a ",
  "livemode": false,
  "refunds": [
    {
      "id": "refund_ee4192ffb6d2caa490a1",
      "amount": 1200,
      "status": "refunded",
      "created_at": 1426412340,
      "updated_at": 1426412340,
    },
    {
      "id": "refund_0e4a34e4ee7281d369df",
      "amount": 1500,
      "status": "refunded",
      "created_at": 1426412353,
      "updated_at": 1426412353,
    }
  ]
}

输出应该是:1200 + 1500 = 2700

Output
|---------
|total
|---------
|2700

请提供全局解决方案,而不是静态数据