addAxisLabelFromFile method
Implementation
Future<LabelAxisOpBuilder> addAxisLabelFromFile(
int axis, String fileAssetLocation) async {
SupportPreconditions.checkNotNull(fileAssetLocation,
message: "File path cannot be null.");
List<String> labels = await FileUtil.loadLabels(fileAssetLocation);
_axisLabels[axis] = labels;
return this;
}