Unfortunately, the there is no integration in place yet between AWS Config Aggregator feature and AWS CloudWatch event rules. The reason for this is the AWS Config Aggregator feature is supporting Multi-account & Multi-region. However, AWS CloudWatch service (event rules) is a regional service. Therefore, at the moment we can't build Cloudwatch event rule based on the aggregated data received from multi-account & multi-region. Hence, as of now there is no out of the box solution.
However that there is an existing feature request in place for this functionality of including CloudWatch Event Delivery along with the Config Aggregation, As is the case with all feature requests, the internal team takes them seriously and evaluates every request, but we are unable to share any rough ETA for delivering this feature as inclusion of any new feature needs rigorous testing and shall be prioritized along with the team's additional workload. However, any new announcements will be made in our What's New page What's New page [https://aws.amazon.com/new/] and our Official Blog [https://aws.amazon.com/blogs/aws/].
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