XWiki is using jodconverter behind the hood to perform the office conversions. The first thing to check would be the way the checkbox are currently transformed by jodconverter by default when performing a conversion from office to html. If there’s a specific information in the html for those boxes, then there should be a way for handling them on XWiki side. If there’s not by default, then you should first check on jodconverter side for creating a dedicated filter to retrieve the information you want.
thank you for your reply. This is what I found out: Libreoffice converts with checkboxes (input type=checkbox), importing in XWIKI checkboxes are ignored.
[EDIT: actually I know where the problem is, it’s because we don’t have a representation for the input elements in XWiki syntax, so those elements are just skipped. It means the fix won’t be easy and it’s more or less expected, so maybe more an improvment for the future than a real bug]