Thanks so much for your prompt reply!Not yet. Adguard can block only in Safari and Safari View Controller that is used by some third party applications, for instance Inoreader. That is valid for all adblockers. However Adguard team is working on a VPN-based ad blocking application that will be able to filter any application that connects on a web.
I guess it's time to switch to Android.I wouldn't recommend AdGuard Pro for iOS, since in its current form it's been discontinued due to Apple's policy.