chartOptionScopes() {
    const {options, type} = this;

    return [
      options,
      overrides[type] || {},
      defaults.datasets[type] || {}, // https://github.com/chartjs/Chart.js/issues/8531
      {type},
      defaults,
      descriptors
    ];
  }
Returns the option scopes for resolving chart options
@return {object[]}