The title says it all....
You can't, and I don't think the ability will be added: INI files are a very old out-of-date technology used since Windows 3.1. It's been completely overtaken by XML, and INI files are not used on the web at all, ever.
How to parse at all ?
Develop games in your browser. Powerful, performant & highly capable.
Before all that, how to load a file? I have been utterly failing to find some method of loading a text file (via plugin or events).