Hi Gabriel,
Thank you for contacting Syncfusion support.
We have checked your requirement ‘To generate a getExportProps() JSON from saveAsJSON() or vice versa’ and we would like to let you know that we have processed the both JSON data in different way i.e. skip the needed default properties based on JSON export and Excel export. And, currently your requirement is not feasible. However, we have considered this as a feature request and it will be available in any of our upcoming releases.
Regards,
Silambarasan I