Does packer vmware support iso_url http authentication

Hi,
I’m using packer / vmware iso to build my images.

We used to use iso_url to pass a public URL to packer, and it worked.

Problem:
We decided to store our ISO files in a private internal artifactory / jfrog repo.
However, I can’t find any method of authentication.
Jfrog supports auth tokens, but I can’t find any parameters in packer for the auth method.
My build fails with a 401 code.

Is it possible to authenticate to a private repo ?

Regards,
Damien