Currently, Facebook doesn't provide automated reporting for Facebook Stories. You can still add these deliverables to your campaigns manually. Here's how:
First, create a deliverable with the label "Facebook Stories", and add the URL of the stories, if you have it.
If you didn't add a deliverable, you'll have to choose a deliverable type here:
Expand the 'Preview & Edit' fields:
Now, you can add the metrics that you see in the Facebook insights dashboard, and if necessary, add screenshots to the card: