To generate document thumbnails in the file managers Gnome or Mate (Nautilus and Caja, respectively), special helpers are used - thumbnailers. The existing thumbnailer generates thumbnails for OpenDocument ods/odt files, but cannot create them for OpenXML docx/xlsx files due to the lack of graphic thumbnails inside them.
The essence of my request:
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generate thumbnails in the documents being processed and they will be processed normally by the existing thumbnailer.
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alternative option - make it possible to launch the office in headless mode with the generation of a graphical representation of the first page of the document and then you can use onlyoffice as a separate thumbnailer.
Additional details can be found here https://askubuntu.com/questions/1368910/how-to-create-custom-thumbnailers-for-nautilus-nemo-and-caja