docs: JSONparse option for json generator(#7577)

Author: colinaaa

src/content/configuration/module.mdx

@@ -188,6 +188,11 @@ module.exports = {
       'css/module': {
         // ditto
       },
+      json: {
+        // Generator options for json modules
+        // Use `JSON.parse` when the JSON string is longer than 20 characters.
+        JSONParse: true,
+      },
       // others…
     },
   },