doing it normally is a god-level tier of hard-work, conscientiousness and stupidity. Watchshadowdragon is a new site which used to do manual work and released its stupidity and turned into writing a scraping script. Tbh a scraping script is not very difficult to write if you understand a programming language like python or js and basic understanding of html and css, spending a few days/weeks learning will save you years of doing sth that programming language can do with a much faster pace.
However, I really recommend manually adding if you self-host and encode the animes yourself from torrents file like nyaa. Writing a bot to scrape nyaa . si is involves much more pain than benefits. Manually choosing the best video source with the best subtitles would work the best. But if you don't want to host the anime yourself, then please write a bot. We're living in the 21st century, not 20th.