https://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/aws-properties-wafv2-webacl-ipsetforwardedipconfiguration.html
AWS::WAFv2::WebACL IPSetForwardedIPConfiguration - AWS CloudFormation
The configuration for inspecting IP addresses in an HTTP header that you specify, instead of using the IP address that's reported by the web request origin....
awscloudformation