[
 {
  "op": "add",
  "path": "/properties/CidrBlock/format",
  "value": "ipv4-network"
 },
 {
  "op": "add",
  "path": "/properties/DefaultSecurityGroup/format",
  "value": "AWS::EC2::SecurityGroup.Id"
 },
 {
  "op": "add",
  "path": "/properties/VpcId/format",
  "value": "AWS::EC2::VPC.Id"
 }
]
