Configuring local cache to also connect with cluster

Folks:

We are looking to leverage JBDG as a hybrid cluster solution, with a local cache for frequently accessed data elements to minimize network hops, while having the same local cache be able to reach into a cache cluster across the network on cache miss for the less frequently used data.

In section 5.3.2 (7.1 documentation), it is stated that a local cache can be added in both library and remote client-server mode. It seems to me that this is indicating we can achieve what we want to achieve, or am I misreading the documentation? Assuming that this is achievable, is there any additional documentation on this topic?

Alternatively, is it possible to configure a library cache to point to a cache cluster as the data source? Or is that the purpose of a remote cache manager?

Thanks in advance.