Finally, someone else is on the same issue. We’re all brothers in arms here. For some reason, almost as if by design, Shopify support/admins on here will never give you a straight answer.
I’m looking for the same thing too. Last I’ve read on here, you have to “What you can do is from your front end, delegate to your backend to make the request, and return the response data from that request to your front end.” Unfortunately, that’s very vague. They’re probably just going to tell you to hire an expert, and not answer the issue publicly.