configuration.nix

{ lib, ... }:
with lib;
{
  services.unbound.settings.server = {
    # settings ...
  } // zipAttrsWith (_:flatten) [
    # in place of imports
    {
      local-zone: ''"local." static'';
      local-zone-tag: ''"local." "local_net"'';
      local-data = [
        "router.local. IN A 10.0.0.1"
        "server.local. IN A 10.0.0.10"
      ];
      local-data-ptr = [
        "10.0.0.1 router.local."
        "10.0.0.10 server.local."
      ];
    }
    
    # ...
  ];
}