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Description
What feature is it?
Enable custom cookie option, to create RSS feed from data that's behind login. Many websites use ReCapchta protection against bot logins, that's why I suppose the --custom-cookie option which can be used anywhere.
What problem does this feature solve?
Get data from website that's behind login. For example a forum that requires login to view forum.
Additional description
The program youtube-dl does have --custom-cookie option if you are interested. But for RSSHub this option needs to be easily available when you create a new route for a new website.