Command that uses zero or more JSON path expressions to extract values from a JSON object.
The JSON input object is expected to be contained in the
Fields.ATTACHMENT_BODY
Each expression consists of a record output field name (on the left side of the colon ':') as
well as zero or more path steps (on the right hand side), each path step separated by a '/'
slash. JSON arrays are traversed with the '[]' notation.
The result of a path expression is a list of objects, each of which is added to the given record
output field.
The path language supports all JSON concepts, including nested structures, records, arrays, etc,
as well as a flatten option that collects the primitives in a subtree into a flat list.