The exclusive subtitle file is usually included inside a MKV container as a separate track. You can use software like to extract the .srt or .ass file from the video.
: Often features user-uploaded subtitles for niche international cinema.
If you cannot find a pre-made file, create your own exclusive version. Use subtitle editing software like to download a raw subtitle file (even a poorly timed one) and manually sync it to your copy of "Ember." This is the most reliable way to get a perfect result, and you can then share it (with credit) as your own exclusive release.