Battery Json Path format

[0lini]

I'm trying to add my battery to my OpenDTU instance. It's a Zendure SolarFlow which I redirect to a local MQTT server via DNS redirect. The battery sends its status via MQTT in a JSON format. This is what a message looks like:

{
  "messageId": "123",
  "product": "solarFlow",
  "deviceId": "_censored_",
  "timestamp": 1735527015,
  "properties": {
    "electricLevel": 8
  }
}

I tried the Battery data from MQTT Broker setting, to no avail. I set this for SoC Value Topic: /73bkTV/censored/properties/report (this topic is correct) and tried those JSON Paths: electricLevel, properties.electricLevel and $.properties.electricLevel. All result in this error, every time a MQTT message is posted to the topic: [MqttBattery] Topic '/73bkTV/censored/properties/report': Unable to access JSON key 'properties.electricLevel' (JSON path 'properties.electricLevel', position 0).

Oli