Google Circle to Search is the most efficient search method ever offered for Android devices. It's a shame, as great and fast as this feature is, it still doesn't support barcode and QR code scanning. This will however change in future updates.
This feature is seen to allow users to scan barcodes or QR codes faster as it supports multiple scans simultaneously. Not only that, each successful scan will also have a preview of the content such as the full URL and more. For now, this feature is still under development as it is still hidden in the Google app version 15.25.32.
Circle to Search will also support audio search soon. Right now this feature is limited to select Samsung Galaxy and Google Pixel users, but in the future it will be extended to more other devices.