Editor for Office in wp admin

Dear all,

I’m searching a way to use a MS Office editor (in particular Excel) inside my admin area.

I don’t need it to publish files with an Excel interface, but for my management in the admin area. In the child theme I have html tables that are generated from Xlsx files: in order to update them, every time I have to edit them from outside, delete the old ones and then upload the new ones via FTP.
Is there an interface that can allow me to do this directly in the admin area? (I’d like without plugins if not necessary).
Thank you all.