How to add android devices for flutter preview, from blank template?

[develorer]

When starting firebase studio with the flutter template, devices are connected:

adb devices
List of devices attached
emulator-5554   device
localhost:5555  device

When I start an empty template in flutter, these devices are not installed:

adb devices
List of devices attached

How can we install these devices, in an empty template?

To try to answer this question, I looked into the 3 flutter related directories in data-connect, but I am not sure this is the right place to see the flutter template?

Thanks!