We will add the “auto-mapping” button for the explicit mode (also mentioned in this topic: Export to Database auto mapping).
However, the “Ignore missing fields” option doesn’t seem necessary. You can simply add the “Select/remove columns” action (before exporting to DB), and in the action click “Select all” to keep only the columns you really want to export.
The “Ignore missing fields” option can be tricky because its behavior is not transparent and can potentially lead to errors.