iOS 16 provides opportunity to allow streaming to Chromecast devices

iOS 16 introduces new extension type that allows third-party streaming devices to be available via standard audio and video routing menu.

This opens an opportunity to provide support for Chromecast or Mirocast streaming devices in system menu. Developers yet to implement this feature in their apps though.

Apple Developer: DeviceDiscoveryExtension

Reference: iOS 16 appears to open the door for Chromecast targets in the AirPlay menu