Thank you for the question! At this time, that feature is not available through the Merch by Amazon portal. However, we are always working to improve the Merch by Amazon experience for both our content creators and our customers. Your feedback and suggestions go a long way to helping us do that. If you have a suggestion for a useful feature, you are welcome file a feature request here. This will allow the community to vote on the idea and provide additional feedback. We also review and share these feature requests with the relevant teams for their review.
If this feature isn't available to you at this time, it should become available as you become a more seasoned member of our forum community.