Welcome to Shopify Community, @ApkaJeijo!
My name is Olivia and I'm part of the Shopify Team. I love this question, and there's a few easy ways to get the information you are after. Let's explore some of those together.
I trust at least one of these options will work for you, but please let me know if you have any further questions I can assist with.
Have a lovely day!
Do you use any email marketing service? If by any chance you use Mailchimp (with ShopSync installed in your shop), then you can create a segment in Mailchimp based on purchasing activity. For instance, you can create a segment consisting of contacts who bought a specific product:
Then you can send a campaign to all emails matching the segment or just export the segment to a CSV file. I guess that other email marketing tools like Klaviyo or Omnisend may have a similar capability.