public RunnerBuilder engineJsonRpcConfiguration(
      final JsonRpcConfiguration engineJsonRpcConfiguration) {
    this.engineJsonRpcConfiguration = Optional.ofNullable(engineJsonRpcConfiguration);
    return this;
  }
Add Engine json RPC configuration.

@param engineJsonRpcConfiguration the engine json rpc configuration
@return the runner builder
app/src/main/java/org/hyperledger/besu/RunnerBuilder.java