What do you mean by "a hex"?

You will need to learn Javascript and understand how Javscript types map to Perl.

If you mean to access packageContests[0].n instead of packageContests.n, that means you need to do it different on the Perl side as well. You will need to treat packageContests as array reference instead of a hash reference:

print $packageContests->[0]->{n};
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The data structures are mapped between Perl and Javascript, but you will need to understand the data structure itself to make use of it.