Lookup from map(string) failed

Hello, I’ve created a route table, and I would like to use mapping, however some of values inside of map is list of strings, and couldn’t find a solution to manage it.

Here is the main.tf

resource "aws_route" "ipv4" {
   count                       = length(aws_route_table.route)
   depends_on                  = [ aws_route_table.route ]
   route_table_id              = aws_route_table.route[count.index].id

   gateway_id                  = lookup(var.ipv4,  "igw",    "")
   nat_gateway_id              = lookup(var.ipv4,  "nat",    "")
   destination_ipv6_cidr_block = lookup(var.ipv4,  "target", "")
}

resource "aws_route" "ipv6" {
   count                       = length(aws_route_table.route)
   depends_on                  = [ aws_route_table.route ]
   route_table_id              = aws_route_table.route[count.index].id

   gateway_id                  = lookup(var.ipv6,  "igw",    "")
   egress_only_gateway_id      = lookup(var.ipv6,  "egw",    "")
   destination_ipv6_cidr_block = lookup(var.ipv6,  "target", "")
}

variable "ipv4"          {
   type        = map(string)
   default     = null
}

variable "ipv6"          {
   type        = map(string)
   default     = null
}

Here is how I’m defining the values
Notice that, if value contains string only, no issue
The issue with nat gateway id, as I have multiple nat gateways

locals {
   ipv4  = {
     public  = {
       target = "0.0.0.0/0"
       igw    = module.internet_gateway.igw_ids # No Issue
     }
     private = {
       target = "0.0.0.0/0"
       nat    = module.translate_gateway.nat_ids # << Here is the list of strings
     }
   }

   ipv6  = {
     public  = {
       target = "::/0"
       igw    = module.internet_gateway.igw_ids # No Issue
     }
     private = {
       target = "::/0"
       nat    = compact(module.private_subnets.ipv6_cidrblock) != [] ? null : module.internet_gateway.egw_ids # No Issue
     }
   }
}

I think I need to somehow make count.index on that lookup block, but I don’t know how

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