Data array in attriute of entity "PV-forecast", how to display in Potly-graph-card

Configuration Frontend
1

Hi there,
I’m stuggling to get a dataarray, which is hold in an attribute, into plotly.
It holds the data of a solar forcast of the next 5 days and I would like to display it in the plotly-graph-card in HA.
Here is the sensor data (shortend for display here, it normally holds data for 5 days, 488 entries):

state_class: measurement
scale: 1.137400354295837
today:
  energy: 40510.5519597371
  complete: true
tomorrow:
  energy: 32448.26784207961
  complete: true
dayAfterTomorrow:
  energy: 43844.20355849278
  complete: true
timeseries:
  start_utc: "2026-08-02T22:00:00+00:00"
  deltas_in_minutes:
    - 15
    - 15
    - 15
    - 15
    - 15
    - 15
    - 15
    - 15
    - 15
    - 15
  values:
    - 0
    - 0
    - 0
    - 296.497
    - 652.6528
    - 631.8647
    - 786.8721
    - 1184.7118
    - 1469.6895
    - 1778.54
unit_of_measurement: W
icon: mdi:solar-power
friendly_name: "[evcc] PV-Prognose"

I am not able to figure out, how I can get the data from the timeseries into the x/y data of plotly.
Any hint would be appreciated.