Probably not going to happen. Free trials have limitations and you must cancel them a minimum of 24 hours before they turn into an annual subscription at the end of the free trial. Your usage of the app is irrelevant and has not bearing on the charge. You failed to cancel the subscription and meet the terms of the legal contract you agreed to when you started the free trial.
You can request a refund from Apple by following the instructions in the Apple Support article I linked below. Please understand that Apple is most likely to deny your request for a refund.
Request a refund for apps or content that you bought from Apple - Apple Support
You will still need to cancel your subscription> Please follow the steps in the support article below.
If you want to cancel a subscription from Apple - Apple Support
If you are granted a refund, you can check on it’s status after 48 to 72 hours using the link below.
Check the status of a refund for apps or content that you bought from Apple - Apple Support