Subscribe to receive/update WebVTT subtitles for HLS stream

Hello. I have an HLS stream with subtitles (WebVTT), this is an m3u8 playlist. I am using the playlist you provided in the HLS example in README.md. This m3u8 playlist has subtitles. Can I somehow subscribe to receive/update these subtitles, such as other metadata?
Just what I tried to do doesn't work:
```
var item = await CrossMediaManager.Current.Extractor.CreateMediaItem("https://devstreaming-cdn.apple.com/videos/streaming/examples/bipbop_16x9/bipbop_16x9_variant.m3u8");
item.MediaType = MediaType.Hls;
await CrossMediaManager.Current.Play(item);
item.MetadataUpdated += (sender, args) =>
{
var subtitle = args.MediaItem.DisplaySubtitle;
DisplayAlert("Info", subtitle, "Ok");
};
```
Is it even possible to do this with the XamarinMediaManager? Thanks for your reply

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