You're not going to find a connector to achieve this. The approach will depend heavily on available APIs and the type of documents you're attempting to convert, e.g., are there graphics, tables, or just text.
The approach I would take is first use browser Developer Tools (F12) and inspect the traffic when you select the Download ➡️ Microsoft Word (.docx). Briefly looking at Googles API docs, I didn't notice any available "download options", but the inspecting the Network traffic may reveal something useful/relevant. If not, you can use the aforementioned Google API doc to read the contents of the file and create your own transform that sends output to a Word Online (Business) connector.