Word allows a user to copy/paste a range of cells directly into a document and they get embedded into the document as a new Excel file which can be opened for editing directly from Word.
The office.js API allows for various things to be inserted into a Word document such as HTML, Image, etc https://docs.microsoft.com/en-us/javascript/api/word/word.range?view=word-js-preview#insertHtml_html__insertLocationString_
Is there a way to insert an Excel worksheet or a range of cells using the office.js API?