How to pass arguments to off-chain worker? AFAIK it is possible to configure session key for offchain worker to consume. But can this session key be arbitrary string?

For example, I would like to pass API key to off-chain worker so it can fetch data from exchanges. The offchain code can check if it has API key configured to do actual work.

In the end, I would like to build an oracle module that allow people to stake to become an operator. Then they can configure a session key and one or more external services API keys to start submit data using offchain worker. This makes a permisionless decentralised oracle network possible.