it works :D

modules/programs/browser.nix

@@ -0,0 +1,13 @@
+{ inputs, ... }: {
+	flake-file.inputs = {
+		helium-browser = {
+			url = "github:schembriaiden/helium-browser-nix-flake";
+			inputs.nixpkgs.follows = "nixpkgs";
+		};
+	};
+	flake.modules.nixos.browser = { pkgs, ... }: {
+		environment.systemPackages = [
+			inputs.helium-browser.packages.${pkgs.stdenv.hostPlatform.system}.default
+		];
+	};
+}