Thank you for asking this question.
At the moment, the only customizations you can do for the Product Stories is to choose between Classic and Modern templates and this can also be changed after you create the product stories.
As the app is still in beta version, we do not have more customizations available at the moment.
If you have any questions, click the bottom right chat icon to talk with our customer success team or send us an email at support@embedsocial.com
We're here for you 🙏