jq一般論
pythonと同じように書けば良い
ピリオド始め + python object + ピリオド繋ぎ
aaa 
  $ watch.bat
  {
      "StackEvents": [
          {
              "StackId": "arn:aws: cloudformation:...",
              ……,
              "ResourceStatus": "CREATE_IN_PROGRESS",
              ……
          }
      ],
      "NextToken": "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"
  }
aaa 
  $ watch.bat | jq ".StackEvents[0].ResourceStatus"
  "CREATE_COMPLETE"
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