Unable to iterate yaml with nested lists

Terraform
1

Have a yaml file as below, cannot create the prefix list. Please help to fix the error

Rules:
- Cidrs:
  - Cidr: 192.168.1.0/32
    Description: "Test"
  - Cidr: 192.168.1.10/32
    Description: "Test1"
- Ports:
  - FromPort: 80
    ToPort: 80
    IpProtocol: tcp

trying to use iterate the yaml files using local block as below

locals {
  config-extended = yamldecode(file("test-extended.yaml"))
  item = flatten([
    for Rules in local.config-extended : [
      for Ports in Rules.Ports : {
        FromPort   = Ports.FromPort
        ToPort     = Ports.ToPort
        IpProtocol = Ports.IpProtocol
      }
    ]
  ])
}

resource "aws_vpc" "testing" {
  cidr_block = "10.0.0.0/16"
  tags = {
    "Name" = "testing"
  }
}

resource "aws_ec2_managed_prefix_list" "test-pl" {
  name           = "test-pl"
  address_family = "IPv4"
  max_entries    = 7
}

resource "aws_ec2_managed_prefix_list_entry" "entry" {
  for_each = {
    for rule in local.item : item.Rules => rule
  }
  cidr           = each.value.Cidrs.Cidr
  description    = each.value.Cidrs.Description
  prefix_list_id = aws_ec2_managed_prefix_list.test-pl.id
}

resource "aws_security_group" "using-prefix-list" {
  name        = "using-prefix-list"
  vpc_id      = aws_vpc.testing.id
  description = "Allow inbound traffic using Prefix List"

  ingress {
    description     = "Allow inbound traffic from the prefix list"
    from_port       = 80
    to_port         = 80
    protocol        = "tcp"
    prefix_list_ids = [aws_ec2_managed_prefix_list.test-pl.id]
  }

  tags = {
    Name = "using-prefix-list"
  }
}

When try to test for clearing the Prefix list part I get the below error

terraform plan
╷
│ Error: Unsupported attribute
│
│   on testing.tf line 12, in locals:
│   12:       for Ports in Rules.Ports : {
│
│ This value does not have any attributes.