Ok. How to verify this? Throuh the NIP’s they offer? Because most relays are not putting this in their description with human readable words. Would may be great, if the client can help with translating some technical stuff into a human readable one. What you think?

It's an unsolved problem. Many relays have a webpage you can visit that explains their policies more thoroughly, for example nostr.wine. nostr.watch is also a useful tool, but right now it's a pretty trial-and-error process. It would be nice to improve.