How can I run multiple Cage instances on different TTYs?

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I’m trying to set up multiple Cage instances on different TTYs. Specifically, I want to run Waydroid on one TTY and GNOME on another (TTY8). Currently, I have this configuration for Waydroid:

services.cage.user = "waydroid";
services.cage.program = "${pkgs.waydroid}/bin/waydroid show-full-ui";
services.cage.enable = true;
services.cage.extraArguments = [ "-s" ];

Is there a way to configure an additional Cage instance for GNOME on TTY8? I tried using services.cage.instances, but it doesn’t seem to be a valid option;)

services.cage.instances = {
  waydroid = {
    user = "waydroid";
    program = "${pkgs.waydroid}/bin/waydroid show-full-ui";
    extraArguments = [ "-s" ];
  };
  gnome = {
    user = "youruser";
    program = "${pkgs.gnome.gnome-session}/bin/gnome-session";
    extraArguments = [ "-s" ];
    vt = 8;
  };
};

What’s the recommended approach for running multiple Cage instances or achieving a similar setup with Waydroid on one TTY and GNOME on another?