For now, the best solution is to use a Chrome extension to enable multi-subtitles on your favorite video streaming website, like Netflix.

There is an ongoing effort to develop a standard for subtitles on Netflix, which would allow viewers to change subtitles for each videos.

This tool has been developed with the aim to help language learners. In particular, for those who cannot understand a video without subtitles, this extension can be very useful.

The user interface of this extension is very simple and you can select the languages you want to enable.