toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (clicks != null) 'clicks': clicks!,
if (ctr != null) 'ctr': ctr!,
if (impressions != null) 'impressions': impressions!,
if (keys != null) 'keys': keys!,
if (position != null) 'position': position!,
};