If any kind of idd to jpg conversion is doable, it would be export of graphics elements from some version of Adobe InDesign documents and saving these objects as standard JPEG pictures.
Files from InDesign can only be opened in the software and in case of old files, perhaps even with a specific version of InDesign. If you have some issues with export of old InDesign documents, it would be best to contact their support or perhaps to reach out to the online user community.