[chef] custom json attributes to powershell variables

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Hi, 

Do you know how I would be able to save JSON custom attributes to a powershell
variable in a recipe?

When I bootstrap a Windows machine I would like to pass the IP, Subnet, GW and
DNS Servers into custom attributes and when the recipe is applied, the windows
machine sets the correct information to the network card (using powershell).

Since knife vsphere doesn't currently support vmware windows customisations I
can't think of another way.

So I would end up with something like this in the recipe (which is a 
powershell
script):

$ipAddress = customIPAttribute
$gateway = customGWAttribute
etc, within the recipe.

Cheers,
Simon.