Uh, not sure I understand. Do you mean you didn't want to write the logic? That issue you point to just means the component doesn't exist out of the box. Is that what you meant?

I wanted to implement some very specific caching rules, based on some POST parameters inside a JSON.

This seems to be possible with nginx and Lua, you extract a unique cache key from your request, and then nginx caching takes care of the rest. But in my case not out of the box or without the paid version.

So I hoped to fix that problem with YARP, but I would’ve needed to implement my own caching as a completely new middleware.

In the end I implemented the caching in the database.