VTT-playlist on native player (WebOS 2.x)

Web App Development
1

Hello all ^^
I create master-playlist with live stream like this:

#EXTM3U
#EXT-X-VERSION:3
#EXT-X-MEDIA:TYPE=AUDIO,URI="audio0.m3u8",GROUP-ID="audio-AACL-138",LANGUAGE="en",NAME="English",DEFAULT=YES,AUTOSELECT=YES,CHANNELS="1"
#EXT-X-MEDIA:TYPE=SUBTITLES,URI="sub0.m3u8",GROUP-ID="text",LANGUAGE="en",NAME="English",DEFAULT=YES,AUTOSELECT=YES
#EXT-X-STREAM-INF:BANDWIDTH=397961,AVERAGE-BANDWIDTH=361783,CODECS="avc1.640028,mp4a.40.2",RESOLUTION=720x480,FRAME-RATE=25.000,AUDIO="audio-AACL-138",SUBTITLES="text"
0.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=631161,AVERAGE-BANDWIDTH=573783,CODECS="avc1.640028,mp4a.40.2",RESOLUTION=360x240,FRAME-RATE=25.000,AUDIO="audio-AACL-138",SUBTITLES="text"
1.m3u8
#EXT-X-STREAM-INF:BANDWIDTH=1214123,AVERAGE-BANDWIDTH=1103750,CODECS="avc1.640028,mp4a.40.2",RESOLUTION=720x480,FRAME-RATE=25.000,AUDIO="audio-AACL-138",SUBTITLES="text"
2.m3u8

and want show subtitles with native player on WebOS 2.x, but can’t find any information about launch showing VTT-playlists. :face_with_head_bandage:
m3u8 with webvtt for example:

#EXTM3U
#EXT-X-VERSION:3
#EXT-X-TARGETDURATION:10
#EXT-X-MEDIA-SEQUENCE:63794422
#EXT-X-INDEPENDENT-SEGMENTS
#EXT-X-PROGRAM-DATE-TIME:2023-02-01T10:41:25Z
#EXTINF:10,
2551776850000000-dur=100000000-seq=63794422.vtt
#EXTINF:10,
2551776950000000-dur=100000000-seq=63794424.vtt
#EXTINF:10,
2551777050000000-dur=100000000-seq=63794427.vtt
#EXTINF:10,
2551777150000000-dur=100000000-seq=63794429.vtt
#EXTINF:10,
2551777250000000-dur=100000000-seq=63794432.vtt
#EXTINF:10,
2551777350000000-dur=100000000-seq=63794434.vtt

How i can show VTT subtitles from m3u8-playlist and sync with stream on native player on WebOS 2.x? :thinking:

2

Currently, only external subtitles in the form of .vtt (WebVTT) are officially supported.
So it should be:

<video src="" controls autoplay width="960" height="540">
    <track default src="subtitle.vtt">
</video>