Mount sshf as a user using home-manager

Help
1

I have the following config in my ~/.config/home-manager/home.nix

{  pkgs, lib, config, security, ... }:
let 
    mountdir_testhost = "${config.home.homeDirectory}/cs/test";
in
{
...
  systemd.user = {
    mounts = {
      mount-test = {
          Unit = {
              Description = "mount test home";
          };
          Mount = {
            What="papanito@test.home:/home";
            Where="${mountdir_testhost}";
            Type="sshfs";
            Options="x-systemd.automount,_netdev,reconnect,allow_other,identityfile=/home/papanito/.ssh/id_rsa";
            #SloppyOptions=
            #LazyUnmount=
            #ReadWriteOnly=
            #ForceUnmount=
            #DirectoryMode=
            #TimeoutSec=
          };
      };
    };
  };
}

and

$ home-manager switch
/nix/store/7rafw8v4snb3a168f0hw31qsd4yrish8-home-manager-generation
Starting Home Manager activation
Activating checkFilesChanged
Activating checkLinkTargets
Activating writeBoundary
Activating installPackages
replacing old 'home-manager-path'
installing 'home-manager-path'
Activating linkGeneration
Cleaning up orphan links from /home/papanito
No change so reusing latest profile generation 3
Creating home file links in /home/papanito
Activating onFilesChange
Activating reloadSystemd

But it seems it’s neither mounted nor is there any service which I could start. Not sure if I miss something or I do misunderstand the concept of mounting fileshares as user.