toJson method
Allows you to serialize object.
Implementation
Map<String, dynamic> toJson() => {
      "overallStatus": overallStatus.value,
      "mrz": mrz.value,
      "text": text.value,
      "docType": docType.value,
      "security": security.value,
      "imageQA": imageQA.value,
      "expiry": expiry.value,
      "vds": vds.value,
      "pagesCount": pagesCount,
    }.clearNulls();