How to add extra information to CAD components, which are then exported (e.g. to 3MF) to work with them afterwards in Unity

Hello everyone,

my goal is to add additional custom information (or comment) to a CAD component. This information should then also be exported to .3mf, .step or similar CAD file formats and will be processed in Unity afterwards.
Currently I am using Siemens NX (with NXOpen/C#) to create the CAD models.
Does anyone know how to solve this problem?

Thanks in advance.
Best regards,