How can read a nested json Map in StepFunction parameter

Question

How can read a nested json Map in StepFunction parameter? below example read dataset1 and dataset2 key from json map? If yes than , how $$.Map.Item.Value pass value to access from ItemSelector

{
  "comment": "Example for InputPath.",
  "dataset1": {
    "val1": 1,
    "val2": 2,
    "val3": 3
  },
  "dataset2": {
    "val1": "a",
    "val2": "b",
    "val3": "c"
  }
}

Need below format in step function map 
"ItemsPath": "$.requestPayload.files",
      "ItemSelector": {
        "requestPayload": {
          "context.$": "$.requestPayload.context",
          "dataset.$": "$.[0].[$$.Map.Item.Value]",
          "file.$": "$$.Map.Item.Value"
        }
      }

Answer

1.`"ItemsPath": "$.requestPayload.files"`: This selects the "files" key from the JSON map located at the path "$.requestPayload.files."

2. `"ItemSelector": { ... }`: The ItemSelector is a set of expressions to access specific keys or values from the selected map element.

3. `"requestPayload.context.$": "$.requestPayload.context"`: This accesses the value of the "context" key from the JSON map located at the path "$.requestPayload.context."

4. `"dataset.$": "$.[0][$$.Map.Item.Value]"`: This selects the first element from the array, which is the current element being processed in the map (specified by "$.[0]"), and then accesses the value based on the key specified by "$$$.Map.Item.Value" (the key in the map being processed).

5. `"file.$": "$$$.Map.Item.Value"`: This directly accesses the value of the current key being processed in the map ("$$$.Map.Item.Value").

With these expressions, you can read and access the keys "Dataset1" and "Dataset2" from the JSON map within the StepFunction parameter.

How can read a nested json Map in StepFunction parameter

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