Splunk App for AWS: How to have VPC Flow Log options available when creating searches in Splunk?

Hi Team, We have configured Splunk App for AWS and configured VPC Flow Log to forward logs to Splunk. We would like to have the options available (like vpc_flow.bytes, vpc_flow.interface_id, vpc_flow.vpcflow_action, etc) on VPC Flow Logs for creating Splunk searches, unfortunately we cannot find documentation. What we are planning to achieve, if it is possible, is to use data model in Splunk for a custom visualization with flow log data.