main.tf

provider "local" {}

variable "servers" {
  type = map(object({
    ip = string
  }))
}

resource "local_file" "vms" {
  for_each = var.servers

  filename = "vm-${each.key}"
  content  = each.value.ip
}

output "ips" {
  value = [for v in local_file.vms : v.content]
}

terraform.tfvars

servers = {
  "server-1" = {
    ip = "10.0.0.2"
  }
  "server-2" = {
    ip = "10.0.0.3"
  }
}