I have an old LED tv and ever since I got Jio's Gigafiber I have been using JioTV as well (actually it's my parents).

My LED tv doesn't have any OS in it, while the Jio TV runs a customized Android version (if I'm not wrong). So this led me to wonder, if people can cast content playing in their phones / computers to JioTV set top box.

My apologies if the feature already exists, I just don't know where it is.