Emulator 27.2.6 is now available in the Canary channel. It includes the new ability to import scene images:

When using the emulator with a camera app, you can import an image in PNG or JPEG format to be used within a virtual scene. To choose an image for use in a virtual scene, click Add image in the Camera -> Virtual scene images tab in the Extended controls dialog. This feature can be used to import custom images such as QR codes for use with any camera-based app.