Problem with Dgraph helm chart serviceAccount creation

I have EBS CSI drvier added as Add-on to EKS, also give node permission to obtain EBS volume per its need.
Here is the screenshot of the driver added to the cluster from aws cli website page.

As far as I observed, some volumes are dynamically attached to the currently Only 1 node dgraph-node-dev even including a snapshot for Dgraph to use, and I haven’t noticed any exceptions.

Since I’ve already added the Driver, what would you suggest for

  persistence:
    storageClass: "gp2"

Should it be ignored or what is the correct storageClass that should be declared here?