it works!!

src/data.rs

@@ -0,0 +1,18 @@
+use serde::{Deserialize, Serialize};
+
+#[derive(PartialEq, Debug, Serialize, Deserialize)]
+pub struct TextData {
+	pub help_expr: String,
+	pub help_vars: String,
+	pub help_panel: String,
+	pub help_function: String,
+	pub help_other: String,
+	pub license_info: String,
+	pub welcome: String,
+}
+
+#[derive(Serialize, Deserialize)]
+pub struct TotalData {
+	pub text: TextData,
+	pub fonts: epaint::text::FontDefinitions,
+}