How to add unformatted disk to lxd VMs?

I would like to add 10 GB of unformatted disks to my running VMs that are running on Ubuntu 18.04.

I am not able to figure out the command. Any help putting it in the VM Profile?

No crossposting please.

As far as I know you can’t just add unformatted disks.
You can add folders, files or block devices.

See here:

You can create volumes though:

lxc storage volume gives you an overview over all commands to manage volumes;
you can apply all keys that are listed in the above link.

Apologies. Thank you for the links.