How to specify `stage` when using `chalice package`?

My goal is to deploy the `chalice` app via a CD pipeline, which I can't do with `chalice deploy` as referenced in [Issue #1570](https://github.com/aws/chalice/issues/1570). As an alternative I am trying to deploy the app via CloudFormation by using the `chalice package` command.

Following the instructions here [https://chalice-workshop.readthedocs.io/en/latest/todo-app/part2/01-package-cmd.html#initial-setup](https://chalice-workshop.readthedocs.io/en/latest/todo-app/part2/01-package-cmd.html#initial-setup), I can create the CloudFormation templates but there's no option to specify which `stage` to deploy. Is there a flag I'm missing?

Start with the `chalice package` command and the linked Chalice workshop packaging instructions, then review the deployment constraint described in Issue #1570. Determine how a requested stage should be selected for the generated CloudFormation templates and verify the result for a CD-pipeline deployment.

Written by the indexing model from the issue text.