Yes. The best way to stream Backbone (and iOS games in general) is by using AirPlay 2 to mirror your iPhone to an Apple TV, and connecting your Apple TV to a capture card setup. This enables low latency streaming with high resolution and a high frame rate. If you don't own an Apple TV and a capture card, you can also use the Streamlabs app to stream directly from your phone.
Yes. You can mirror your screen via Chromecast (on devices with screencast support). This in combination with a capture card setup enables low latency streaming with high resolution and frame rate. Additionally, you can stream to Youtube directly through the youtube app on your Android device. Learn more here.