Websockets in ApolloGateway... how to

I noticed that websocket support is not realized in federation support, why not? The idea of centralizing a websocket connection makes a lot of sense… if we are to imagine a fully realized real-time API with a gateway pointed to subgraphs, each service could implement their own redis pubsub for instance and we could have a centralized socket connection to the client. I noticed upon this library, apollo-federation-tools, but while the project has had updates the npm module is completely out of date…
Will there be websocket support in apollo-gateway and apollo-router at some point? How popular is this feature? I would imagine it’s a very popular one. In case you are struggling with federation tools, see if this helps: apollo-gateway-subscription - npm