nixos-config/modules/system/services/general/portals/default.nix

{ config, lib, pkgs, ... }:
{
  xdg.portal = lib.mkIf config.system.desktop.enable {
    wlr = {
      enable = lib.mkForce true;
      settings.screencast = {
        max_fps = 60;
        chooser_type = "simple";
        chooser_cmd = "${pkgs.slurp}/bin/slurp -f %o -or -B 00000066 -b 00000099";
      };
    };
    extraPortals = with pkgs; [
      xdg-desktop-portal-gnome
    ];
  };
}