AWS App Runner services can now communicate with other applications hosted in an Amazon Virtual Private Cloud (Amazon VPC). You can now connect you App Runner services to databases in Amazon Relational Database Service (Amazon RDS), to Redis caches in Amazon ElastiCache, or to message queues in Amazon MQ. You can also connect your services to your own applications in Amazon Elastic Container Service (Amazon ECS), Amazon Elastic Kubernetes Service (Amazon EKS), or Amazon Elastic Compute Cloud (Amazon EC2). As a result, web applications and APIs running on App Runner can now get powerful support from data services on AWS to build production architectures.
Source:: Amazon AWS