Need Access to CodeCommit Repo from Different Account

Hi CodeCommit team,

I am trying to use a CodeCommit repo for an Amplify App, which is being spun up in CloudFormation. I am able to attach a Github repo to the app using an access token (can be generated through developer settings in Github) but I would like to use CodeCommit. I would also like to deploy that CloudFormation template in different accounts from where that CodeCommit repo lives. I have tried attaching an IAM role to the Amplify app but got the error "Requested repository not found" after providing the repo's HTTP URL. I don't believe this is currently supported because CloudFormation only checks your account for the repo (repo URL's in CodeCommit do not point to a specific AWS account and are not globally unique).

Arn: none

Thanks,
Ben