How to log key/value pairs in Uber Zap without using Fields

I am using zap library for logging and I try some simple scenario in which I want to log several entries without using Fields. Unfortunately it doesn't work.

Code

cfg := zap.Config{
   Encoding:         "json",
   Level:            zap.NewAtomicLevelAt(zapcore.DebugLevel),
   OutputPaths:      []string{"stderr"},
   ErrorOutputPaths: []string{"stderr"},
   EncoderConfig: zapcore.EncoderConfig{
      MessageKey: "message",

      LevelKey:    "level",
      EncodeLevel: zapcore.CapitalLevelEncoder,

      TimeKey:    "time",
      EncodeTime: zapcore.ISO8601TimeEncoder,

      CallerKey:    "caller",
      EncodeCaller: zapcore.ShortCallerEncoder,
   },
}

logger,_ := cfg.Build()

logger.Debug("This is a DEBUG message”)       // works

logger.Info("This is an INFO message”, ”aaa”) // Error

Is there a way to log any key/value pair without providing Field arguments?

I tried removing the message entry in the config without success (it omits all messages)

[I]s there a way to use zap without key and val ?

No.