What (if any) would be the best approach for Kafka Streams to build a table/stream fetching the data lazily when the key we asking for is not found there?

Let’s say there’s a stream A of user actions with user id field and the goal is to enrich it with user data (email, name etc.) joining on user id with table/stream B which provides the user data, but if user id key is not found in B – we fetch data and put it there. The intent is to expose this as a usual stream/table.

Thank You!

Not sure if I found anything yet.