itemValueForHTMLMode(value) {
    if (Array.isArray(value)) {
      const values = value.map(item => Array.isArray(item) ? this.itemValueForHTMLMode(item) : this.itemValue(item));

      return values.join(', ');
    }

    return this.itemValue(value);
  }
Returns the item value for html mode.
@param {any} value - The value for this component.
@returns {any} - The value of the item for html mode.