Hi Alison,
Thank you for posting in the community.
According to our research and tests, we are sorry that there are not other out of box ways to achieve your idea.
However, we found you may try to first create a SharePoint List then use Power Automate to create the folder template in SharePoint online modern library. Like shown below:
If you have any further concerns, feel free to contact me. We will further assist you.
Best Regards,
May