Yes, the file is available in the upstream repository.
Same deal for incus, we have a bash completion script, our Debian packages include that file as you can see when using tab-completion at Linux Containers - Incus - Try it online
I’m using incus 0.6 installed via the Zabbly deb repository on Ubuntu 22.04 minimal, and was also not getting autocompletion features. After installing bash-completion, which is not part of Ubuntu minimal, and restarting the terminal session, I’m getting all the nice auto completion.