Codeartifact resource policy with Codebuild role

[OperationalFallacy]

I'm building CDK Pipeline that publishes CDK constructs library as npm in AWS Codeartifact

AWS docs say Codeartifact permissions work on the resource level.

Is there a way to get the role ARN from the CodeBuildStep construct?

I don't see how it is possible https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.pipelines.CodeBuildStep.html