Is it possible to remove disk1 naming for ova images created with packer?

I am creating an ova image with packer build command. The ova image has vmdk and other needed files as usual but uses disk1 naming on vmdk. Is it possible to remove this disk1 naming and make it productimage.vmdk directly while building with packer.

If it is not possible, can I untar this ova, rename vmdk and repack it using tar with ova naming and make it work?

$ tar xvf productimage.ova