Sensors not showing in statistics diagram card

You can but it would be better if the integration was updated to support this.

There was an issue open about it but it was let go stale and was closed:

Until this is fixed you can add state_class: measurement to the sensors using customize:

e.g. configuration.yaml

homeassistant:
  name: Home
  unit_system: metric
  # etc

  customize:
    sensor.h_t_keller_humidity:
      state_class: measurement
    sensor.h_t_keller_temperature:
      state_class: measurement
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