Document nested group support for AsyncAPI

api-playground/asyncapi-setup.mdx

@@ -95,9 +95,37 @@
 ```
 
 <Note>
   The `directory` field is optional. If not specified, Mintlify adds the files to the **api-reference** folder of the docs repository.
 </Note>
 
+### Examples with nested groups
+
+The `asyncapi` property supports nested groups. Mintlify generates the channel pages and adds them to the nested group, alongside any existing pages.
+
+This is useful when you want to organize WebSocket channels as a subsection of a broader API group, or when you need to combine multiple AsyncAPI specifications under a shared parent group.
+
+```json
+"navigation": {
+  "tabs": [
+    {
+      "tab": "API Reference",
+      "groups": [
+        {
+          "group": "Voice API",
+          "pages": [
+            "voice/overview",
+            {
+              "group": "Voice API Commands",
+              "asyncapi": "/path/to/voice-asyncapi.json"
+            }
+          ]
+        }
+      ]
+    }
+  ]
+}
+```
+
 ## Channel page
 
 If you want more control over how you order your channels or if you want to reference only specific channels, create an MDX file with the `asyncapi` property in the frontmatter.