Made it work

modules/hardware/xremap.nix

@@ -0,0 +1,39 @@
+{ inputs, ... }:
+
+{
+	imports = [
+		inputs.xremap-flake.nixosModules.default
+	];
+
+	services.xremap = {
+		withHypr = true;
+		userName = "jonas";
+		config = {
+			modmap = [
+				{
+					name = "Capslock to esc and ctrl";
+					remap = {
+						"CAPSLOCK" = {
+							"alone" = "ESC";
+							"held" = "CTRL_L";
+						};
+						"ESC" = "CAPSLOCK";
+					};
+				}
+				{
+					name = "Switch super and alt";
+					remap = {
+						"SUPER_L" = {
+							"alone" = "ALT_L";
+							"held" = "ALT_L";
+						};
+						"ALT_L" = {
+							"alone" = "SUPER_L";
+							"held" = "SUPER_L";
+						};
+					};
+				}
+			];
+		};
+	};
+}