is it possible to display number of week in row with selected week or in toolbar?

I tried to use ToolbarComponent, but it override all header. But I want to keet it the same as it's just to add information about selected week

```
class CustomElements extends PureComponent {
  renderWrappedWeekDay = (date, selectedDate, dayInCurrentMonth) => {
    const { classes } = this.props;

    let dateClone = date.clone();
    let selectedDateClone = selectedDate.clone();

    const start = selectedDateClone.startOf("week").toDate();
    const end = selectedDateClone.endOf("week").toDate();

    const dayIsBetween = dateClone.isBetween(start, end, null, []);
    const isFirstDay = dateClone.isSame(start, "day");
    const isLastDay = dateClone.isSame(end, "day");

    const wrapperClassName = clsx({
      [classes.highlight]: dayIsBetween,
      [classes.firstHighlight]: isFirstDay,
      [classes.endHighlight]: isLastDay
    });

    const dayClassName = clsx(classes.day, {
      [classes.nonCurrentMonthDay]: !dayInCurrentMonth,
      [classes.highlightNonCurrentMonthDay]: !dayInCurrentMonth && dayIsBetween
    });

    return (
      <div className={wrapperClassName}>
        <IconButton className={dayClassName}>
          <span>{dateClone.format("DD")} </span>
        </IconButton>
      </div>
    );
  };

  render() {
    const { selectedDate } = this.state;

    return (
      <DatePicker
        label="Week picker"
        value={selectedDate}
        onChange={this.handleWeekChange}
        renderDay={this.renderWrappedWeekDay}
        labelFunc={this.formatWeekSelectLabel}
      />
    );
  }
}

```

example <https://codesandbox.io/s/week-picker-36ig1>