JSON macros fail for multi-document YAML targets

When the target of a jsonpathExpression is YAML file containing multiple documents (separated by ---) the extension fails with a WARN log message:

    msg: {
      "msg": "Invalid source file ...",
      "error": {
        "name": "YAMLParseError",
        "code": "MULTIPLE_DOCS",
        "message": "Source contains multiple documents; please use YAML.parseAllDocuments() at line XX, column Y: ... ---  ...",
        "pos": ... ,
        "linePos": ... ,
      
      },
      "useId": 0,
      "jsonpath": "jsonpathExpression"
    }

I'd expect a multi-document yaml file to be presented as a top-level array.