The modern standard is to use a proxy like Prowlarr or Jackett . These tools provide a feed that Sonarr can parse more reliably.
Here’s a short, actionable piece for setting up as an indexer in Sonarr (primarily for anime): sonarr nyaa indexer
It allows Sonarr to perform Searches (Manual and Automatic) for specific episodes, rather than just waiting for them to appear in a feed. The modern standard is to use a proxy
Maya kissed the top of his head. “Good boy.” She pointed at the server rack. “Not you. The other good boy.” sonarr nyaa indexer
Anime is unique because the release group (SubsPlease, Erai-raws, Judas, B-Global) matters more than the file name. Nyaa allows you to prioritise specific groups via Sonarr's "Release Profile" feature.