toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (CLS != null) 'CLS': CLS!,
if (FCP != null) 'FCP': FCP!,
if (INP != null) 'INP': INP!,
if (LCP != null) 'LCP': LCP!,
if (TBT != null) 'TBT': TBT!,
};