jt to cgr conversion describes export 3D content between JT Open CAD 3D models used in Siemens software to a format specific for Dassault Systems, the MultiCax drawing (.cgr) from CATIA. There are no recent articles about such export on the Internet, and the last bit of information is over decade old.
Your best option to deal similar conversions is to use dedicated tool, such as the CrossManager. But it might be possible that plugins can be used to add support for JT format in CATIA and such migration of 3D content can be done as well.
Updated: October 30, 2023