toJson method
Serialise to JSON.
Implementation
Map<String, dynamic> toJson() => {
if (inputTokens != null) 'input_tokens': inputTokens,
if (outputTokens != null) 'output_tokens': outputTokens,
if (outputTokensBreakdown != null) 'output_tokens_breakdown': outputTokensBreakdown,
if (totalTokens != null) 'total_tokens': totalTokens,
};