Since you are using a separate JS files you need to get the value into JS so that your script can use it.
You do this by localizing the script. See https://developer.wordpress.org/reference/functions/wp_localize_script/ and look at the user contributed notes.
Basically you
1) register the script
2) localize the script using values in acf fields
3) in your script you get the value from the js object created in step 2 to get the value
