infra/module/aspect/virtualisation/virtualbox/virtualbox-host.nix

{
  den.aspects = {
    virtualbox-host = {
      nixos = 
        { pkgs, ... }:
        {
          virtualisation = {
            virtualbox = {
              host = {
                enable = true;
                package = pkgs.virtualbox;
              };
            };
          };
        };
      };
    };
}