How to set charset=“utf-8” in the javascript file itself

Question

I am trying to set charset=\"utf-8\" inside the javascript file itself, not in the script tag, I know that I can do this:

Answer 1

I found another way, so instead of declaring charset="UTF-8" for the script tag like this:

I can declare the charset for the web page itself using meta tag, so I can append to the DOM dynamically, and end up with something like:

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