This is an example of an ExternalLookup configuration that uses StaticDataSource and DropDownRenderMode.

{
  "DataSourceType": "STATIC",
  "DataSourceObject": [
    {
      "ID": 1,
      "Title": "CZK"
    },
    {
      "ID": 2,
      "Title": "EUR"
    },
    {
      "ID": 3,
      "Title": "GBP"
    },
    {
      "ID": 4,
      "Title": "USD"
    }
  ],
  "IndexValue": {
    "Expression": "{ID}"
  },
  "TextValue": {
    "Expression": "{Title}"
  },
  "RenderMode": "DropDown",
  "EmitEmptyItem": true
}
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