Hello Oliver,
Unfortunately there is no way to adjust it to default Contact Form widget. You can try to search for some external module that will meet your requirements and embed it via HTML widget.
Thank you very much for your idea! I have already added it to our Feature Requests List. Our developers will consider adding this feature in one of our future updates.
We really appreciate our customer's feedback. Please, contact us anytime!
Best regards,
Mathew Brown