I'm afraid I have to refuse.
The plugin "ePub Extended Metadata" is intended to read ONLY the metadatas defined in the ePub standard, and thus in the OPF. And nowhere else.
I suggest you open a new thread in Calibre>Géneral or Calibre>Library Management, and explaining in detail your situation, with an example of the source file and the information to be extracted (maybe several).
It's probably possible to do this programmatically, with a python script, but this is not the right place to this.
Good luck and have a nice day.
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