Create Azure Routes for all Azure Route Tables

Terraform Providers Azure
1

Hello folks,

I am trying to create a set of Azure routes for all route tables keeping reusability in mind. Here is my code.

locals {
    location = "westeurope"
    route_tables = {
        efw-trust = {
            resource_group = "my-rg-1"
        },
        ifw-untrust = {
            resource_group = "my-rg-2"
        },
        efw-ha = {
            resource_group = "my-rg-3"
        }
    },
    routes = {
        udr-01 = {
            resource_group_name = "my-rg-1",
            address_prefix = "10.110.0.0/16"
        },
        udr-02 = {
            resource_group_name = "my-rg-1",
            address_prefix = "10.130.0.0/16"
        },
        udr-03 = {
            resource_group_name = "my-rg-2",
            address_prefix = "10.240.0.0/16"
        },
        udr-04 = {
            resource_group_name = "my-rg-3",
            address_prefix = "172.30.30.0/24"
        },
        udr-05 = {
            resource_group_name = "my-rg-3",
            address_prefix = "10.150.0.0/16"
        }
    }
}
resource "azurerm_route_table" "this" {
  for_each                      = local.route_tables
  name                          = "rt-${each.key}"
  location                      = local.location
  resource_group_name           = "rg-${each.value.resource_group}"
  disable_bgp_route_propagation = false
}

resource "azurerm_route" "this" {
  for_each               = local.routes
  name                   = each.key
  resource_group_name    = each.value.resource_group_name
  route_table_name       = each.value.route_table_name
  address_prefix         = each.value.address_prefix
  next_hop_type          = "VirtualAppliance"
  next_hop_in_ip_address = "172.24.256.100"
}

route_table_name in resource.azurerm_route.this is the main point of confusion for me.
My question is how do I loop through the route tables in the resource.azurerm_route.this resource without writing multiple instances of azurerm_route resource code and hardcoding the route table name?