The apps just offer a subset of core features still, and though the features are expanding, this isn't available on the app yet.
The reason for this is that the apps are natively programmed (Which is desirable, but also very time consuming to create and maintain, with the effort doubled because of iOS and Android.)
So there is not a 1 to 1 with web site features.
Having said all that, listing blocked users would be one of the easier features to add - so I'll try to squeeze this in. Generally, I lead on Android, then port to Apple at a later date - so if you are and Android user, expect this a little earlier. (Clans feature on Android has still not made it to iOS, but will on the next update.)