Perhaps not the best answer, but exiftool can add that metadata after the fact.

-m

On March 7, 2017 8:55:17 AM PST, Csikos Bela <bcsikos425@freemail.hu> wrote:
>Dear context users:
>
>In latex I could use \pdfinfo command to add information metadata to
>pdf file:
>Title, Author, Creator, Producer, CreationDate, ModDate, Subject,
>Keywords.
>I found that I can set title, author, subtitle (=subject) and keyword
>with
>\setupinteractions command.
>
>How can I set the remaining ones (CreationDate, ModDate, Creator,
>Producer)?
>
>Thank you in advance,
>
>bcsikos
>
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