How to insert a Google goal into Bitrix?

Question

1C-Bitrix

Hello, I'm not strong in Bitrix, but you need to set the Google goal in this quick order form ..
Where and how to insert this code correctly?

onclick="gtag('event', 'fast-zakaz', {'event_category': 'zakaz'});"

10,000 character limit, hence the link.
https://disk.yandex.ru/d/HanIu8pWcUj9Uw