Zephyr API to get details of Test Cases under a Test Cycle

I was looking into their API documentation but even after 2 years they haven't introduced this feature, I can see there are links to test plan and issue links but not the vital one which is Test Cases.

It can be argued to fetch from execution, but it's not efficient when it comes to large volume as saketmahajan said, it can affect rate limits increase calls on the server side and most importantly time consuming process.

Hope Smart Bear prioritizes this and add this as a feature!