I guess that this is not possible with the current version of ConfiForms. Nevertheless, I wanted to venture a question. Maybe I have overlooked a corresponding virtual function or some other possibility.
I know that I can access the storage format via Confluence's REST API. However, I am interested in a more direct solution.
Use case is to create a page at the root level of a space. According to the answer to a related question, this is not possible. By manipulating the storage format of an existing page at the root level, I could achieve the same goal.