[Cache Rules] Document "is in list" and "is not in list" operators in hostname match expressions

src/content/docs/cache/how-to/cache-rules/examples/cache-by-hostname-list.mdx

@@ -0,0 +1,29 @@
+---
+pcx_content_type: example
+summary: Cache everything for hostnames in a list
+title: Cache everything for hostnames in a list
+description: Cache everything for hostnames in a list
+products: [cache-rules]
+---
+
+import { Example } from "~/components"
+
+[Create a cache rule](/cache/how-to/cache-rules/create-dashboard/) to cache everything for hostnames that match a [custom hostname list](/waf/tools/lists/custom-lists/#lists-with-hostnames):
+
+<Example>
+
+- **When incoming requests match**: Custom filter expression
+  - Using the Expression Builder:<br/>
+    `Hostname is in list "my_hostnames"`
+  - Using the Expression Editor:<br/>
+    `(http.host in $my_hostnames)`
+
+- **Then**:
+  - **Cache eligibility**: Eligible for cache
+
+</Example>
+
+:::note
+
+The **is in list** operator requires an Enterprise plan. You must first [create a hostname list](/waf/tools/lists/create-dashboard/) in your account before you can reference it in a cache rule expression.
+:::

src/content/docs/cache/how-to/cache-rules/settings.mdx

@@ -59,12 +59,19 @@ The operators available for Cache Rule expressions are:
 - does not end with
 - is in
 - is not in
+- is in list
+- is not in list
 
 :::note
 
 Not all operators are available for every selected field.
 :::
 
+:::note
+
+The **is in list** and **is not in list** operators are available for the Hostname field on Enterprise plans. They allow you to match requests against [custom lists](/waf/tools/lists/custom-lists/) — for example, a hostname list containing all the domains you want to apply a particular caching configuration to. Refer to [Use lists in expressions](/waf/tools/lists/use-in-expressions/) for details on using lists in rule expressions.
+:::
+
 ## Cache eligibility
 
 In **Cache eligibility**, you have the option to select **Bypass cache** if you want matching requests to not be cached, or **Eligible for cache** if you want Cloudflare to attempt to cache them.