Sadly no, and the Google Play store is so poor for Android TV there are 2 versions of the "Google" app for search and I've had it ask which I want to run (wtf lol). That and a ridiculously outdated YouTube app and they dropped the Nexus Player... kinda shows they don't give a shit about Android TV.

Nothing for the Shield 2017

It should be included in the Android O update - out near the end of the summer. https://www.theverge.com/2017/5/17/15648978/google-android-tv-update-assistant-io-2017

No but you can get it on an iphone