Merge fields from two Loggers

[lawmatsuyama]

Hi!
Is there a way to merge fields from two Loggers?

I know there is no Fields in Logger but I want to do something like that:

	l1, _ := zap.NewProduction()
	l1.Sugar().With("name", "Roger")

	l2, _ := zap.NewProduction()
	l2.Sugar().With("age", 25)

	l := l1.With(l2.Fields)
	l.Info("user info")

print

{"level":"info","msg":"user info", "name": "Roger", "age": 25}

Is it possible to achieve a similar result?