How to rollback in Amazon ECS with Amazon ECR?

I am stuck at with the rollback strategies on Amazon ECS using Amazon ECR as docker registry. I want to maintain the latest 5 image versions(say latestv1 latestv2 latestv3 latestv4 latestv5 etc) and Want to rollback to latestv4 if the code on latestv5 fails.

I have tried using amazon ecr cli and It gives me the all of the unsorted tags.

aws ecr describe-images --repository-name api-gateway-demo --output json --query imageDetails[*].imageTags 

Output:

[
    [
        "latestv2"
    ], 
    [
        "latestv1"
    ], 
    [
        "latestv5"
    ], 
    [
        "latestv3"
    ], 
    [
        "latestv4" 
    ]
]

Any idea to manage the versioning of the images for better deployment/rollbacks on ECR?