Mqtt multiple sensor discovery

Configuration
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1

Is it possible to discover multiple sensors with a single discovery topic?

I have sensors that publish on sensor/<id> with the payload:

{"Sequence": 32570,"Watt":  685.20,"kWh": 2475.654,"battery": 100,"FreqErr": 0.28,"Sensor":<id>}

The following discovery message works for a single sensor but would it be possible to discover all sensors with one discovery message?

{
"device": { "name": "Sensor 123", "identifiers": "123", "model": "Sense", "manufacturer": "Acme Inc."}, 
"unit_of_measurement": "kWh", 
"json_attributes": ["Sequence", "FreqErr", "battery"], 
"name": "Sensor123 kWh", 
"unique_id": "sensor_123_kwh", 
"state_topic": "sensor/123", 
"value_template": "{{ value_json.kWh | round(2) }}"
}

What i want is to auto generate 123 based on what is published on sensor/.

Edit:

I’ve come so far that I’ve created the following automation, but I don’t know a reasonable condition to stop spamming the mqtt.

- id: 'MQTT_auto'
  alias: Sensor auto-conf
  trigger:
  - platform: mqtt
    topic: sensor/+
  condition: []
  action:
  - data_template:
      payload: >
        {"device": {"sw_version": "215a4aa", "name": "Sensor", 
                    "identifiers": "{trigger.payload_json.Sensor}}", 
                    "model": "Sense", "manufacturer": "Acme Inc."}, 
        "unit_of_measurement": "kWh",
        "json_attributes": ["Sequence", "FreqErr", "battery"], 
        "name": "Sensor {{ trigger.payload_json.Sensor }} kWh", 
        "unique_id": "sensor_{{trigger.payload_json.Sensor}}_kwh", 
        "state_topic": "sensor/{{trigger.payload_json.Sensor}}",
        "value_template": "{{'{{ value_json.kWh }}'}}"}
      topic: home/sensor/sense/{{ trigger.payload_json.Sensor }}/config
    service: mqtt.publish
2

Hello, I use unique topics for each device.
My main reference for my realitations was MQTT Discovery

May your question is answered there.

3

The idea behind auto discovery was that each sensor would send its own discovery string when it starts up.

You are better off just writing a standard sensor defintion than trying to send mqtt messages from HA to configure sensors.