In addition to the booleans show_labels and is_plain_text that already appear in my image attachments and have been tested, I will add "for special plugin use only": is_base64 plus an editable combobox with a dropdown list of all currently existing MIME Types. Arbitrary string values may be entered too because the combobox items will be editable.
Standard Calibre will not, at least until Kovid wants it to, even look at those special use values. My code changes that I will submit later today certainly will not.
DaltonST
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