Is there a way to write a metadata.json with a fileObject (a csv file) which refers to public URLs for images.

[gsaluja9]

I was trying to come up with a croissant metadata for a dataset I want to publish as croissant format.
My source comprises of a csv where each line has a column called url (to an image) and some other properties tied to that image.

While the docs call out the sc:ImageObject in some examples, they are based of a combination of fileSet and content of file.

I looked at the _extract_value and _cast_value, for IMAGE_OBJECT (in but could not determine a combination.
I would assume this is a common way to publish a dataset containing images.

Any pointers to accomplish this would be helpful.
Thanks.