Thank you for adding webp and the other formats.
I have found one bug that makes it so that it doesn't process the cbz. If an "&" is present in the comicinfo.xml it shows this error. I just changed the "&" to anything else and it accepted it.
Code:
Traceback (most recent call last):
File "calibre_plugins.EmbedComicMetadata.ui", line 96, in main_menu_triggered
File "calibre_plugins.EmbedComicMetadata.main", line 33, in import_to_calibre
File "calibre_plugins.EmbedComicMetadata.main", line 115, in iterate_over_books
File "calibre_plugins.EmbedComicMetadata.main", line 18, in _import_to_calibre
File "calibre_plugins.EmbedComicMetadata.comicmetadata", line 77, in get_comic_metadata_from_file
File "calibre_plugins.EmbedComicMetadata.comicmetadata", line 375, in get_comic_metadata_from_cbz
File "calibre_plugins.EmbedComicMetadata.comicinfoxml", line 49, in metadataFromString
File "xml\etree\ElementTree.py", line 1311, in XML
File "xml\etree\ElementTree.py", line 1653, in feed
File "xml\etree\ElementTree.py", line 1517, in _raiseerror
ParseError: not well-formed (invalid token): line 3, column 24