ACM Private CA certificate and private key export

I’ve created an aws_acm_certificate resource that is signed by our private CA which is managed in AWS ACMPCA. I need to get the contents of both the private key and certificate for use with non AWS managed resources. This can be accomplished with the AWS CLI by running a command similar to aws acm export-certificate --certificate-arn arn:aws:acm:us-east-1:accountid:certificate/ca8f821f-55a6-4e51-b11d-9aa1af18270f. I’ve tried outputting the certificate_body and private_key attributes of the resource, but they end up being null. Is there any way of doing this with terraform currently or should I submit a feature request?