Pinning providers in Nous Portal?

I've noticed that my ratio of cached to uncached tokens should result in my usage costs being quite a bit lower.

I've then let Claude code test caching behavior on Nous Portal and the results apparently weren't great and certainly do not match the way higher ratio the hermes desktop app is displaying - rather the Claude code results would come closer to what I was billed.

Therefore I assume that Nous Portal suffers from the same issue as OpenRouter, which can be resolved by pinning to certain providers.

Is this possible for Nous Portal?