Is It Possible to Generate Custom Excel Files?

In this project that I mentioned about for IITH in the manifest. This has got me thinking I'm wondering if you could take a template, combine it with liquid and the data and have the resulting merge sent out to the browser. And what I'm thinking of use case is generating an XML file, so XML Excel file or something like that. Now when you do that with Excel files because it's like XML based, you can do that, right? The only thing is if the schema changes, you have to make those changes as well of course. But well, even the XML structures very well defined. So I think mostly for most solutions,you can do something that's sustainable for