Add SCIM Bridge Docker image to Amazon ECR public repository?

I was wondering if it'd be possible to upload the https://hub.docker.com/r/1password/scim to a https://docs.aws.amazon.com/AmazonECR/latest/public/public-repositories.html (in addition to Docker Hub), e.g. https://gallery.ecr.aws/1password/scim.

General reason: some AWS services, like https://docs.aws.amazon.com/apprunner/latest/dg/what-is-apprunner.html, can only fetch images from an ECR endpointhttps://docs.aws.amazon.com/apprunner/latest/dg/service-source-image.html. Unfortunately, AWS's ECR pull-through feature only supports Quay and ECR public at the momenthttps://aws.amazon.com/blogs/aws/announcing-pull-through-cache-repositories-for-amazon-elastic-container-registry/. I understand this is more of a short-coming on AWS's part; however, this would be a nice convenience to avoid managing a private ECR repo and re-uploading the image from Docker Hub (e.g. Docker Hub -> intermediate machine -> private ECR pipeline).

Personal bias: The https://github.com/1Password/scim-examples/tree/master/aws-ecsfargate-terraform fortunately doesn't suffer this issue, being able to pull from Docker Hub directlyhttps://github.com/1Password/scim-examples/blob/51d6f620840a557531bf40ed5003e3349c1d49d9/aws-ecsfargate-terraform/task-definitions/scim.json#L4. Nevertheless, I wanted to try out AppRunner (with EC) to see if it would be a better fit for my use case. I have things up and running no problem, but would be an improvement to eliminate the private ECR repo.
Also happy to share the AppRunner Terraform I have to the scim-examples repo if that's helpful.

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