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Collabora Online may be what you are looking for. It's commercial, but it is LibreOffice (Collabora is a major contributor to LibreOffice). https://www.collaboraonline.com/writer/

There is plain LibreOffice Online, but it is apparently frozen at the moment: https://www.libreoffice.org/download/libreoffice-online/

I used both, LibreOffice calc for heavier data analysis than Google Sheets can handle. Google can also read LibreOffice's file formats easily.

Check out the onlyoffice links above for a remote floss alternative.