Problems extracting sensordata out of MQTT

Hey There,
I have a long journey behind me of getting modbus raw data into hass.io. I finally managed through the node-red plugin, where I connect to my modbus devices and read out the data, convert it and send it through mqtt.
The ariving data format I see in my mosqitto:

Nachricht 1 empfangen auf stromzaehler/1/ um 21:46:
{
“Energiebedarf_Waermepumpe”: [
3548.8540000000003
]
}
QoS: 0 - Retain: false

it seems to be a standard json format, but I am to stupid to get it into my configuration in a proper manner to see as as a sensor value in hass.io

My yaml config is:

  • platform: mqtt
    name: “Energiezaehler_Waermepumpe”
    state_topic: “stromzaehler/1/”
    unit_of_measurement: “kWh”
    value_template: ‘{{ value_json.Energiebedarf_Waermepumpe.0}}’
    availability:
    • topic: “homeassistant/status”
      payload_available: “online”
      payload_not_available: “offline”
      json_attributes_topic: “home/sensor1/attributes”
      value_template: >
      {{ value.split(’;’)[0] }}

but i do not get it running with the value in the sensorvalue. it always shows me the same:

I go crazy, can someone help me?
Thanks alot!
Alex

value_template: '{{ value_json["Energiebedarf_Waermepumpe"][0] }}'

Thank you! you are my hero! I knew that it could have been so easy…