In some regions (like the US and UK), you can subscribe to the Hotstar add-on through Amazon Prime Video Channels. This gives you access to the same subtitled library.
You get the original high-definition broadcast quality. The subtitles are professional, accurate, and synced perfectly. Chandra Nandini Full Episodes Online English Subtitles
The production house has uploaded many episodes officially on YouTube. In some regions (like the US and UK),