Can Packer builder support the builder vm as dual networks vm

Packer
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For Packer builder subnetwork field in GCP, i would like to create a dual network packer builder vm, one subnetwork is private vpc and another one is share vpc subnetwork, while the subnetwork is a string. seem this is impossible

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  1. In your Packer template, you would define the builders for the virtualization platform you are using. Specify the necessary settings such as the type of virtual machine, networking 마나토끼 configurations, and other relevant options.