1. Title -> AWS::Events::Rule -> Target -> EcsParameters (new properties), should work for ECS and Fargate - it should support scheduling of tasks.
2. Scope of request -> Add Group, LaunchType, NetworkConfiguration and PlatformVersion as valid properties in AWS::Events::Rule --> Target --> EcsParameters
3. Expected behavior ->
4. Test case recommendation (optional) ->
5. Links to existing API doc (optional) ->
6. Category tag (optional) -> Compute
7. Any additional context (optional)

See
CFN ECSParameters: https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-events-rule-ecsparameters.html
CWE ECSParameters: https://docs.aws.amazon.com/AmazonCloudWatchEvents/latest/APIReference/API_EcsParameters.html