Mi Flower Care sensor via MQTT (Theengs) has missing sensors

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I might need a little help from you guys:

I got a new (and first) Xiaomi Flower Care sensor yesterday. To connect this to HA, without adding more hardware (ESP etc.), I use my Android Dashboard tablet with the Theengs app.
This app sends the data via MQTT to HA, which also does receive it.
The problem is, the MQTT-telegrams might not be properly interpreted.
I can only see temperature and light-intensity, but none of the really interesting values, such as fertility and moisture.
See here:

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image1358×642 38.9 KB

I’m really a MQTT novice, but I’ve already seen that the telegrams do contain the data-points, here is the data from the integration:

Payload for LUX (same exists for temperature)

{
  "device": {
    "connections": [
      [
        "mac",
        "5C857E135A0D"
      ]
    ],
    "identifiers": [
      "5C857E135A0D"
    ],
    "manufacturer": "Xiaomi/VegTrug",
    "model": "HHCCJCY01HHCC",
    "via_device": "020000000000",
    "name": "Flower care"
  },
  "device_class": "illuminance",
  "state_class": "measurement",
  "state_topic": "+/+/BTtoMQTT/5C857E135A0D",
  "unique_id": "5C857E135A0D-lux",
  "unit_of_measurement": "lx",
  "value_template": "{{ value_json.lux | is_defined }}",
  "name": "HHCCJCY01HHCC-lux"
}

Here are the telegrams, clearly containing the moisture and fertility apart from lux:

Received 14:51:23
Topic: homeassistant//BTtoMQTT/5C857E135A0D
QoS: 0
Payload: {"id":"5C:85:7E:13:5A:0D","name":"Flower care","rssi":-81,"brand":"Xiaomi/VegTrug","model":"MiFlora","model_id":"HHCCJCY01HHCC","type":"PLANT","lux":329,"mac":"5C:85:7E:13:5A:0D"}
Received 14:51:40
Topic: homeassistant//BTtoMQTT/5C857E135A0D
QoS: 0
Payload: {"id":"5C:85:7E:13:5A:0D","name":"Flower care","rssi":-82,"brand":"Xiaomi/VegTrug","model":"MiFlora","model_id":"HHCCJCY01HHCC","type":"PLANT","moi":21,"mac":"5C:85:7E:13:5A:0D"}
Received 14:51:43
Topic: homeassistant//BTtoMQTT/5C857E135A0D
QoS: 0
Payload: {"id":"5C:85:7E:13:5A:0D","name":"Flower care","rssi":-89,"brand":"Xiaomi/VegTrug","model":"MiFlora","model_id":"HHCCJCY01HHCC","type":"PLANT","fer":134,"mac":"5C:85:7E:13:5A:0D"}

Can you help me, how to get the fertility and the moisture into HA? These are the main measurements for which I’ve bough the sensor (and I want to get more if it is working!)