Kerliza,
It might be possible to structure an epub this way, with additional image folders. It is just that Sigil doesn't support infinite variations in doing so. They wanted to be sure that anything produced was valid, so it is limited in its possible output as I understand it. It is already a million line program, and the idea of a ten million line program might have had not so much appeal to the developers.
You might be able to accomplish this in a way I have seen it done in some other books - by file name. A possible might be ch1Image1, ch1Image2, etc. Not elegant but it might be possible. You might select just a chapter's worth at a time and use the ch1, etc at the base as they get renamed. But it isn't going to give you descriptive names.
A clunky but useable work around could be to unzip the epub file to a work directory and open a graphics program which has a preview function which would allow to roll over each name and see the image.
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