Separate subtitle and closed captions displaying

[gizomo]

I use the test sample of HLS from Apple.

The playlist contains subtitles in WebVTT format and closed captions in CEA-608 format.

#EXT-X-MEDIA:TYPE=CLOSED-CAPTIONS,GROUP-ID="cc1",LANGUAGE="en",NAME="English",AUTOSELECT=YES,DEFAULT=YES,INSTREAM-ID="CC1"
#EXT-X-MEDIA:TYPE=SUBTITLES,GROUP-ID="sub1",LANGUAGE="en",NAME="English",AUTOSELECT=YES,DEFAULT=YES,FORCED=NO,URI="s1/en/prog_index.m3u8"

If the subtitles and closed captions have the same attributes, then by default hls.js does not create a separate track for closed caption and shows both subtitle and closed caption at the same time.

Is it possible to force hls.js displaying all subtitles and closed captions as separate tracks and activate them separately?