Amazon Web Services (AWS) developers using Visual Studio Code (VS Code) can now use IntelliSense to write Amazon Elastic Container Service (ECS) task definitions. This can save you lots of time by avoiding manual typing and catching easy to miss errors. These changes are already available in the VS Code toolkit for AWS so current users who have auto updates enabled don’t need to install anything to get this functionality.  

from Recent Announcements https://aws.amazon.com/about-aws/whats-new/2019/10/amazon-elastic-container-service-now-supports-intellisense-in-visual-studio-code/