One simple approach is first set up Conversion Goals with your Google Analytics, you can follow this guide: https://support.google.com/analytics/answer/1136960?hl=en
Then simply import these conversion events from Google Analytics to Google Ads, like this: https://support.google.com/analytics/answer/1034306?hl=en
Let me know if my answer is of any help, with a thumb up or like
Are you using Shopify's Google channel? They will automatically do this for you.
Yes, there is a way. The easiest is to import from analytics which should be setup fully and accurately already. (If you need help, follow this.) With that done, you can create goals in analytics and import them into Google Ads. Far easier then creating conversion snippets directly through Google Ads, which often break from theme changes.