To obtain this data, what you can do is:
- Download the Subscriptions - Churned export
- Go to the expiration_reason column to filter out either voluntary or involuntary churn reasons depending on which category you're looking at 1st
- Then compare the trial_ends_at date with the expires_at date column.
If the subscription expired on the same date as the trial_ends_at date, then this means that the customer was never billed. If the expiration date is after the trial_ends_at date, then this means the subscription did convert and the customer was billed.