How to get values from for_each map output

Terraform
1

I am trying to create a tgw vpc attachments, but how ever i am not able to get the vpc_id and subnet_ids from the output. Below are the tfs:

main.tf

  providers = {
    aws = aws.generic
  }
  source   = "terraform-aws-modules/vpc/aws"
  for_each = local.vars.vpcs
  name     = each.value.name
  cidr     = each.value.cidr

  azs             = ["${data.aws_region.region.name}a", "${data.aws_region.region.name}b", "${data.aws_region.region.name}c"]
  private_subnets = each.value.private_subnets
  public_subnets  = each.value.public_subnets
  intra_subnets   = each.value.intra_subnets

  private_subnet_names  = ["${each.value.name}-Private 1A", "${each.value.name}-Private 1B", "${each.value.name}-Private 1C"]
  public_subnet_names   = ["${each.value.name}-Public 1A", "${each.value.name}-Public 1B", "${each.value.name}-Public 1C"]
  database_subnet_names = ["${each.value.name}-Transit 1A", "${each.value.name}-Transit 1B", "${each.value.name}-Transit 1C"]

  enable_nat_gateway     = true
  single_nat_gateway     = true
  one_nat_gateway_per_az = false
}

output.tf

output "vpc_ids" {
  value = tomap({
    for k, vpc in module.us-east-2 : k => vpc.vpc_id
  })
}

output "private_subnets" {
  value = tomap({
    for k, vpc in module.us-east-2 : k => vpc.private-subnets
  })
}

tgw-attachement.tf

module "tgw" {
  providers = {
    aws = aws.generic
  }
  create_tgw = local.vars.create_tgw
  share_tgw  = "false"
  source  = "terraform-aws-modules/transit-gateway/aws"
  
  vpc_attachments = {
    vpc = {
      tgw_id = "tgw-0b6fb46d17e2952d2"
      vpc_id       = < vpc_id >
      subnet_ids   = < private_subnets>
      dns_support  = true

        }
    }
}

terraform output result:

Changes to Outputs:
  + private_subnets = {
      + vpc-dev     = [
          + (known after apply),
          + (known after apply),
          + (known after apply),
        ]
      + vpc-ops     = [
          + (known after apply),
          + (known after apply),
          + (known after apply),
        ]
      + vpc-staging = [
          + (known after apply),
          + (known after apply),
          + (known after apply),
        ]
    }
  + vpc_ids         = {
      + vpc-dev     = (known after apply)
      + vpc-ops     = (known after apply)
      + vpc-staging = (known after apply)
    }

I needed to create 3 tgw attachment with each vpc_id and private_subnets. How can i call the value in tgw-attachment.tf

2

Something in the lines of:

module "tgw" {
  ... [ the rest of your input vars here ] ...
  vpc_attachments = { for k, vpc in module.us-east-2 : k => 
    {
       tgw_id       = "tgw-0b6fb46d17e2952d2"
       vpc_id       = vpc.vpc_id
       subnet_ids   = vpc.private-subnets
       dns_support  = true
    }
  }
}

Haven’t tested it though.