Antennapod is my default podcast app and it's flawless. Recently I tried some other apps and saw this feature which you can search through episodes too. That was really useful option and I hope we can see it on Antennapod too.

edit: This feature request is for searching through episodes of all indexed podcasts not just within subscribed ones.

edit2: reference images with the feature I saw in other apps. (first one is Antennapod fork)