Can we make `<user>.standalone.enable = true;`create a `<user>@<host>` output?

[MarkusLohmayer]

Again, my full appreciation for this library!

As the title says, I would find it very useful if setting <user>.standalone.enable = true;would still create a <user>@<host> output.

In this way, the home config can be used in standalone (say on an Ubuntu system with Nix installed) and it can be used on a NixOS system as well.

What are your thoughts on this?