config: format json hbs as json (#540)

tooling/prettier/index.mjs

@@ -18,6 +18,14 @@ const config = {
   importOrderParserPlugins: ["typescript", "jsx", "decorators-legacy"],
   printWidth: 120,
   importOrderTypeScriptVersion: "4.4.0",
+  overrides: [
+    {
+      files: "*.json.hbs",
+      options: {
+        parser: "json",
+      },
+    },
+  ],
 };
 
 export default config;