nixos/laptop/modules/home/dconf/apps.nix

{
  ...
}:

{
  dconf.settings = {
    "org/gnome/Console" = {
      custom-font = "FiraCode Nerd Font Mono 11";
      use-system-font = false;
    };

    "org/gnome/TextEditor" = {
      custom-font = "Fira Code weight=450 11";
      use-system-font = false;
    };
  };
}