code: private static TimeSeriesCollection createAdditionalDataset(TimeSeries series) {
          ClosePriceIndicator indicator = new ClosePriceIndicator(series);
          TimeSeriesCollection dataset = new TimeSeriesCollection();
          org.jfree.data.time.TimeSeries chartTimeSeries = new org.jfree.data.time.TimeSeries("Btc price");
          for (int i = 0; i < series.getTickCount(); i++) {
              Tick tick = series.getTick(i);
              chartTimeSeries.add(new Second(new Date(tick.getEndTime().toEpochSecond() * 1000)), indicator.getValue(i).toDouble());
          }
          dataset.addSeries(chartTimeSeries);
          return dataset;
      }
docs: Builds an additional JFreeChart dataset from a ta4j time series.
  @param series a time series
  @return an additional dataset