Hello
If you would share more information on what you will be doing, how you will be using those files, perhaps that will help to see the whole picture.
Out of the box packer takes an iso, create a VM with a VDI disk and OVF definition, then at the end, it export the VM and creates a OVF file and a VMDK file.
format
(string) - Either "ovf" or "ova", this specifies the output format of the exported virtual machine. This defaults to "ovf".
I don't think there is a way to set the name of the disk as its created automatically.
the VDI disk is done with the name of the box, but the export add the num of the disk:
alvaro
You could override this last part and tell packer to export as OVA instead of OVF.