The Vega specification as a JSON string, with the selected datasets and signals removed.
An array of JSON strings representing the selected datasets that were extracted from the specification. Each string contains the dataset name and its values.
An array of JSON strings representing the selected signals that were extracted from the specification. Each string contains the signal name and its value.
Exported Vega content with separated specification, datasets, and signals. Datasets and signals that are present in the attributes are not included in the specification.