How can I copy the current subtitle to YouTube without having to open the transcription window?

How can I copy the current subtitle to YouTube to the clipboard without having to open the transcription window?

Example, in the video below, I would like to copy the current subtitle

But if it lands in the air, the virus can land on a particle and stay floating there for up to 3 hours.

in the clipboard

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As mentioned above, I don't want to open the transcription window:

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