early enqueueing javascript file in page template, not in functions.php

Short Answer: Yes, but…

Just make sure your call to wp enqueue script is before the call to get_header(). The problem is that when you’re in a later part of your template the header including the script is already sent to the browser so you can’t change it any more.

While this is possible I’d still encourage you to reconsider and put this in the functions.php or a simple plugin. Enqueueing scripts is application logic and therefore shouldn’t be in a template.

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