Here is a blog that describes this in detail: https://aws.amazon.com/blogs/aws/learn-from-your-vpc-flow-logs-with-additional-meta-data/
When you create a new VPC Flow Log, in addition to existing fields, you can now choose to add the following meta-data:
pkt-srcaddr : the packet-level IP address of the source. You typically use this field in conjunction with
srcaddr to distinguish between the IP address of an intermediate layer through which traffic flows, such as a NAT gateway.
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