community.general/test/integration/targets/sns_topic/templates/updated-policy.json

{
    "Version":"2012-10-17",
    "Id":"SomePolicyId",
    "Statement" :[
        {
            "Sid":"ANewSid",
            "Effect":"Allow",
            "Principal" :{
                "AWS":"{{ sns_arn.split(':')[4] }}"
              },
            "Action":["sns:Subscribe"],
            "Resource": "{{ sns_arn }}",
            "Condition" :{
                "StringEquals" :{
                    "sns:Protocol":"email"
                 }
            }
        }
    ]
}