private data objects on smartcard

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Hi there,

The opnPGP smartcards seem to have private data objects to store
arbitrary data, right? It seems even the old 1.1 version cards feature
these objects.

How do you write to these objects? Can GnuPG do this? I didn´t found any
way with --card-edit or --card-status. And can GnuPG read these objects?

I read somewhere, the size of these objects is 2048 bytes each. How many
of these objects do exist on a smartcard?

Thanks!