Google maps gpx export - save dialog in JavaScript

I'm working on a GoogleMaps project and want to offer the users to save the current route as a GPX-file. I haven't found any function or possibility to do that. So I thought maybe to go through the mapoverview array and save the coordinates and data after that. (open file dialog with JavaScript) Now I only have appended the data to a text area, but it slows down the page extremely. I didn't find anything to offer the generated data to be able to download. -> Store it in a variable? I have read that JavaScript can't write to User File System. But I only want to offer the data to be downloaded or right click - save as. Has anyone any idea?

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