How to query validator data in `cosmwasm` contract.

I want to query validator data in cosmwasm contract, what should I do? (like: delegation，stake，voting_power...data(validator-set))

The issue asks how a CosmWasm contract can query validator-set data such as delegation, stake, and voting power, but names no file, test, or entry point. First clarify whether the project should document or implement this capability; completion is not defined by the issue.

Written by the indexing model from the issue text.