Resolved: How to get all CIDR’s of a existing VPC and add them to security group as inbound rules using Terraform?

data "aws_vpc" "example_vpc" {
  id = "vpc-xxxxx" # Replace with the ID of your VPC
}

output "vpc_cidr_block" {
  value = "${data.aws_vpc.example_vpc.cidr_block}"
}

data "aws_vpc" "example" {
  id = "vpc-0f67a3b2exxxxxx"
}

resource "aws_security_group_rule" "example" {
  type              = "ingress"
  from_port         = 22
  to_port           = 22
  protocol          = "tcp"
  cidr_blocks       = data.aws_vpc.example.cidr_block_associations[*].cidr_block
  security_group_id = "sg-0e40fe769816xxxxx"
}

cidr_block_associations = [
  {
    association_id = "vpc-cidr-assoc-0b3673ed50fcxxxxx"
    cidr_block     = "172.31.0.0/16" # default CIDR
    state          = "associated"
  },
  {
    association_id = "vpc-cidr-assoc-050fdc9392e9xxxxx"
    cidr_block     = "172.32.0.0/20" # associated CIDR
    state          = "associated"
  },
]