docs(guides/database/full-text-search) update searching multiple columns guide

Update searching multiple columns guide with a workaround involving

apps/docs/pages/guides/database/full-text-search.mdx

@@ -227,6 +227,9 @@ final result = await client
 
 ### Search multiple columns
 
+Right now there is no direct way to use Javascript or Dart to search through multiple columns. A workaround exist where using SQL is required.
+The method involves creating [computed virtual columns](https://postgrest.org/en/stable/api.html#computed-virtual-columns).
+
 To find all `books` where `description` or `title` contain the word `little`:
 
 <Tabs
@@ -247,6 +250,38 @@ where
   @@ to_tsquery('little');
 ```
 
+</TabPanel>
+<TabPanel id="js" label="JavaScript">
+
+```sql
+CREATE FUNCTION title_description(books) RETURNS text AS $$
+  SELECT $1.title || ' ' || $1.description;
+$$ LANGUAGE SQL;
+```
+
+```js
+const { data, error } = await supabase
+  .from('books')
+  .select()
+  .textSearch('title_description', `little`)
+```
+
+</TabPanel>
+<TabPanel id="dart" label="Dart">
+
+```sql
+CREATE FUNCTION title_description(books) RETURNS text AS $$
+  SELECT $1.title || ' ' || $1.description;
+$$ LANGUAGE SQL;
+```
+
+```dart
+final result = await client
+  .from('books')
+  .select()
+  .textSearch('title_description', "little")
+```
+
 </TabPanel>
 <TabPanel id="data" label="Data">