Adding external jQuery control on a Form

Is it possible to include an external jQuery control (in my case the control is a counter) on a Form?
What is the procedure to follow?
The only thing I have is .js file. I know I have to include it in my project (by dragging - dropping) but I do not know what are the next steps in order to ‘see’ the control on the form.

Thank you.

I believe you’ve asked this before:

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I wasn’t aware of those rules. Thank you very much.