How to implement gtag.js event for Google conversion tracking

Hi
I would to add a gtag.js event for Google conversion tracking (see the article: https://developers.google.com/analytics/devguides/collection/gtagjs/events ) in the form where a user will download a file after submit the form.
If I'm not wrong I should insert the code in "On Sublmit" section before "File Download" action (see the image below). Could you confirm?
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The code I have to insert is a Java Script and Custom code seems to support PHP not Java Script. How can I do it?
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Hope you can help me soon
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Thanks
Giulia

Hi Giulia,
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You just add <script src="address of file"></script> to a custom code action on the page where you want the file to load

Hi Max
so I have to create before a js file with my code and then I should insert the cusom code as you specified. Is it correct?

no, use the address of file provided by Google

Hi Max
maybe there is a misundarstanding: the google page I inserted in the post is the example og Google Guide how to implement the code of event tracking
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I need to insert a code like this:
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gtag('event', <action>, {  'event_category': <category>,  'event_label': <label>,  'value': <value>});

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How I can insert this code?
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Custom action allows only php or html not javascript

You can insert the code using a Load JavasScript action, but this code you posted should be changed according to your page data!

Yes I know I have to customize it.
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I put following code il Load Javascript before the download pdf action, but I'm not sure if I have to leave the tag <script> ....</script>. Could you confirm?
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<script>
gtag('event', 'download', {
'event_category': 'file-pms',
'event_label': 'wp'
});
</script>

yes, remove the <script> </script> tags