See: https://bugs.chromium.org/p/chromium/issues/detail?id=777175#c3

Quote:
"""
Just tried this on Android to begin and noticed one thing. When using the Talkback screen reader and I open up the Add Exception UI, the focus goes directly into the edit field and reads out the example url in there. I would prefer that the window title is announced "add exception" and that the focus stars at the top instead of in that text entry field, to give the user a bit more context without having to navigate backwards to learn. Could that change be made, to have the window title announced? 
"""

Focusing the input field will get TalkBack to announce the label without announcing the context. The reason why this is done is likely because we want the keyboard to show up. Is there a way to improve this situation?