Automatically play subtitles – JS player

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Hi,
I have a videos with several subtitle tracks, and I would like to automatically play the first CC track. I did see this answer:

However this only works for the iframe player. For various reasons I would like to use the JS player. How can this be accomplished for the JS player?
I was not able to locate any kind of template file loaded by the JS player in which I was able to modify a similar setting.

Thank you in advance for your help.

 

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