Do these tickets in Github describe your requirement? It’s not a feature right now, but looks like it is in planning for future release if you are able to wait:
Alternatively, you have some other options:
You can publish a policy to the portal without docs, those docs could be linked to on a different site. Not elegant perhaps!
You can customise the portal, either by adjusting the current templates if fully on-prem, or if using SaaS, you could use a custom portal hooked into the API Calls - there is a wordpress API Management plugin that does this and might be helpful for customising what you need, there is also a third party custom portal, which could form basis of a customised development. In either of these customisation approaches, perhaps you could use our “tagging” feature to define what was displayed?