Need help Apex and Data Generator

Configuration Frontend
1 
type: custom:apexcharts-card
graph_span: 25h
span:
  offset: '-1h'
now:
  show: true
  label: Jetzt
all_series_config:
  unit: cent
header:
  show: true
  show_states: true
  colorize_states: true
  title: Preis Forecast
series:
  - entity: ostrom.price
    data_generator: |
      return entity.map((start, index) => {
        return [new Date(start).getTime(), entity.[index]];
      });

{{ states(‘ostrom.price’) }}

Output:
[27.62, 25.15, 24.04, 23.44, 23.6, 24.22, 24.22, 25.14, 28.07, 29.71, 33.01, 32.47, 29.71, 28.26, 28.08]
index 1 ist the actual hour

but my datagenerator dont shows data

3

working Graph:

type: custom:apexcharts-card
graph_span: 36h
span:
  start: hour
  offset: +0h
now:
  show: true
  label: Jetzt
all_series_config:
  unit: cent
header:
  show: true
  show_states: true
  colorize_states: true
  title: Preis Forecast
series:
  - entity: ostrom.price
    data_generator: |
      return entity.attributes.raw.map((start, index) => {
        return [new Date(start["date"]).getTime(), (entity.attributes.raw[index]["grossKwhPrice"] + entity.attributes.raw[index]["grossKwhTaxAndLevies"])];
      });
    extend_to: false