toJson method
Implementation
@override
Object toJson() => {
if (answer case final answer?) 'answer': answer.toJson(),
if (answerableProbability case final answerableProbability?)
'answerableProbability': encodeDouble(answerableProbability),
if (inputFeedback case final inputFeedback?)
'inputFeedback': inputFeedback.toJson(),
};