I have to update some existing ARM templates to deploy a pair of resources (NSG, VNet) to multiple resource groups, where the resource groups are passed to the template as an array.

Q: How do I make the VNet depend on the NSG that’s in the same resource group?

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",

  "parameters": {
    "listOfRGs": {
      "type": "array",
      "defaultValue": ["rg1", "rg2",..."rgN"],
    }
  },
  "resources": [
    "copy": [
      {
        "name": "rgNsgCopyIdx",
        "count": "[length(parameters('listOfRGs'))]",
        "input": {
           "type": "Microsoft.Network/networkSecurityGroups",
           "name": "myNSG",
           "resourceGroup": "[parameters('listOfRGs')[copyIndex('rgNsgCopyIdx')]]",
           .... and some other properties
        }
      },
      {
        "name": "rgVNetCopyIdx",
        "count": "[length(parameters('listOfRGs'))]",
        "input": {
           "type": "Microsoft.Network/virtualNetworks",
           "name": "myVNET",
           "resourceGroup": "[parameters('listOfRGs')[copyIndex('rgVNetCopyIdx')]]",
           "dependsOn": [
             "<WHAT GOES HERE TO DEPEND ON THE NSG IN THE SAME RESOURCE GROUP>"
           ]
        }
      },
    ]
  ]
}