How does pkg_info get the dependencies of a package?

Hello everyone, hope you're having a good day.

I am trying to understand how does pkg_info -f
show the dependencies of a certain package?

Does it use the OpenBSD::PackingList perl module
for showing the dependencies? If yes,then how does
the perl module work? I don't know a lick of perl,
so I cannot understand the source code. If someone
can please take some time to explain to me how it works,
then I'd be very thankful!

Best,
Neel