missing params in create instance json

Create instance json not considering new nic creation with private ipv4 address

 % oxide --insecure instance create --json-body /Users/jatinderluthra/Documents/oxide_cli/create_instance_from_image.json --profile jl-df-silo --project ocp-cer
tification
failed to parse /Users/jatinderluthra/Documents/oxide_cli/create_instance_from_image.json: missing field `params` at line 35 column 3

Below template create with oxjson

% cargo run -p oxjson -- instance create --json-body-template
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.05s
     Running `target/debug/oxjson instance create --json-body-template`
{
  "boot_disk": {
    "description": "",
    "disk_backend": {
      "disk_source": {
        "image_id": "",
        "type": "image"
      },
      "type": "distributed"
    },
    "name": "",
    "size": 0,
    "type": "create"
  },
  "description": "",
  "external_ips": [
    {
      "pool_selector": {
        "ip_version": null,
        "type": "auto"
      },
      "type": "ephemeral"
    }
  ],
  "hostname": "",
  "memory": 0,
  "name": "",
  "ncpus": 0,
  "network_interfaces": {
    "type": "default_dual_stack"
  },
  "ssh_public_keys": [
    ""
  ]
}```

Start with the oxjson instance create --json-body-template entry point and compare its output with the create-instance JSON expected by oxide instance create --json-body. Reproduce the missing params error using the shown template and private IPv4 NIC case. Done means the generated template includes the required NIC parameters and the resulting JSON parses successfully.