In a JSON and REST data source, it is possible to specify a schema by URL or file path. A schema defines the exact structure of a JSON file.
This means that a JSON file can differ each time it is called up. A field content can also be zero. In addition, an entire table or a field can also be missing.
A FirstSingleSchema is supported. Useful for generating this file is e.g. https://www.jsonschema.net/.