Indeed, Infinispan 9 integration with Hibernate now lives in Infinispan itself. This work was initiated with Infinispan 9.1 but was completed in Infinispan 9.2 which will be released in the next few weeks.

Documentation on using Infinispan 9.x with Hibernate can be found here, and you can find simple tutorials on using it standalone, with a Spring application or in Wildfly here.