Is there a way to import a range selected in Excel to my web application?

I'm trying to import a selected range in excel to my web application (JSF with JavaScript).

I'm already able to import an entire excel file with file upload and I can also copy content of excel file, paste it in some kind of text input and parse it afterwards. But I would really love to have the behavior when one excel uses a selected range of another one.

I'm aware that this is maybe not possible because the browser's runtime is seperated from the client (which runs excel) for very good reasons. Nevertheless I just wanted to check if there is a good idea outside which I didn't found in my web search.

excel range select