Custom export filter: how to use the "Number" formatter

I am building an exporrt filter that produces CSV output.
I want to use the built-in export formatter “number” as listed in
How should I use this formatter? I made some attempts but they did not work.

Sth like \format[Number]{\author} should work

That works indeed, thanks;
Result of your example is that just a number goed to the output.
So \format[Number]{\Bibtextkey} also works and produces the same output.

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