How is elixir-devel/pkg-plist generated?

From: Pat Maddox <pat_at_patmaddox.com>
Date: Mon, 12 Dec 2022 01:02:24 UTC
Looking at 
https://github.com/freebsd/freebsd-ports/blob/main/lang/elixir-devel/pkg-plist 
I assume it’s generated by a script.

Can someone please share the script?

Thanks,
Pat