How to update a KOTS airgap installation from the command line?

( There’s another question on the forum with similar title but it’s for Classic, so not useful here. )

If you have an airgap installed via k kots install --airgap-bundle... and you want to upgrade to a new bundle, one might think you plop the new .airgap file in the same place and give another kots command to start pushing images and run an upgrade. I can’t find that incantation, is it not implemented?

Is the only method to use the admin console and upload the new .airgap via web browser?