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Crescendo63 - I suggest you create a simple DOCX that attaches the template that has the Styles you want to use for lists and post it here or at
https://bugs.launchpad.net/calibre so that Kovid can take a look at it.
FWIW - for highly structured documents, such as yours appears to be, I sometimes use the Mammoth DOCX->EPUB converter which requires creating a reusable mapping of the DOCX Styles to an EPUB stylesheet. I use it via a Sigil plugin (wrapper) called DOCX Input.
BR