In the LokiStack Documentation doesn't exist any reference to how to set up the CA for when connecting to the object storage. 

This configuration is needed always when it's used ODF as object storage, but it's also needed for other Object storage solutions where the Object storage uses certificates where the CA is not trusted by the OS, as they can be Dell, Hitachi or custom certificates.

In the past, long time ago, it was reported for ODF in:

1.  https://issues.redhat.com/browse/OBSDOCS-1037 
2. https://issues.redhat.com/browse/OBSDOCS-682 where making reference to a sentence that existed in the past in Logging v5 for how to create the secret with the certificates, but not how to configure them.