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Having read the "Zenphoto image metadata processing" page, and then having uploaded the IPTC Reference Image (https://iptc.org/std/photometadata/examples/IPTC-PhotometadataRef-Std2019.1.jpg) to Zenphoto, I can see how the fields map across.
However, there isn't a mapping from the metadata to the Zenphoto Custom Data field. Would it be possible to create one, please? Any little-used metadata field that will hold a lot of characters would be fine for me (maybe the JPEG Comment field).
The reason is that I am digitising a lot of old photographs, and want to use the Custom Data field as a notepad to record items of interest, such as any text written on the back of the photo. For data security, I would like to keep all of the data with the image, so adding it into the metadata seems the best way to do so, but I then need a way to copy it across to Zenphoto.