Parsing error tfvars to json

[iamshinto]

Parsing error: tfvars to json:

terraform.tfvars:

ping_sg_cidr = {
  1 = {
    cidr_blocks = [
      "0.0.0.0/0"
    ]
    from_port   = 8
    to_port     = -1
    description = "Allow ping connections"
    protocol    = "icmp"
    self        = false
  }
}

Current output:

{
  "ping_sg_cidr": {
    "1": {
      "cidr_blocks": [
        "0.0.0.0/0"
      ],
      "from_port": 8,
      "to_port": "${-1}",
      "description": "Allow ping connections",
      "protocol": "icmp",
      "self": false
    }
  }
}

Expected output:

{
  "ping_sg_cidr": {
    "1": {
      "cidr_blocks": [
        "0.0.0.0/0"
      ],
      "from_port": 8,
      "to_port": -1,
      "description": "Allow ping connections",
      "protocol": "icmp",
      "self": false
    }
  }
}

Python code:

import hcl2, json
with open('terraform.tfvars') as f:
    print(json.dumps(hcl2.load(f), indent=2))