How can i join two topics in stream?

Checklist

• [ V] I have included information about relevant versions
• [ V] I have verified that the issue persists when using the master branch of Faust.

It is not guided how can i join multiple topics in stream, Is the faust support the join two topics in live?

Versions

• Python version 3.8
• Faust version 1.10.4
• Operating system mac m1
• Kafka version none
• RocksDB version (if applicable) none