It's not possible to import an Excel file into a page, however, you can attach the file into the page and visualise it using the Files and Images macro: https://confluence.atlassian.com/doc/display-files-and-images-245827130.html
Mmm, this has come up with a couple of clients - no-one has yet managed to answer the question "what do you expect to create if you 'import' from Excel"? A simple table, yes, but attaching it and using the Excel macro does that. How would you convert a complex set of sheets, rows and columns into a document format? There's no generic answer anyone can code for.
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