Transform rules Available fields list is missing Custom Metadata field

[blogtutor]

Existing documentation URL(s)

https://developers.cloudflare.com/rules/transform/response-header-modification/reference/fields-functions/

What changes are you suggesting?

We are using Custom Metadata and noticed that cf.hostname.metadata is not in the list. We were able to get it to work by wrapping it in a lookup_json_string function:

lookup_json_string(cf.hostname.metadata, "response_header")

Seems like this should get added to the list?

Additional information

Please don't disable this functionality! 😂