gistfile1.txt

esphome:
  ...
 libraries:
   - Wire
   - "climateguard/ClimateGuard RadSens"
 includes:
   - RadSens1v2/_CG_RadSens.h

 i2c:

...

sensor:
  - platform: custom
    lambda: |-
      auto rad_sens = new MyRadSens();
      App.register_component(rad_sens);
      return {rad_sens->IntensityDynamic_Sensor, rad_sens->IntensityStatic_Sensor};
    sensors:
      - name: "Dynamic intensity"
        id: dynamic_intensity
        accuracy_decimals: 1
        unit_of_measurement: μR/h
      - name: "Static intensity"
        accuracy_decimals: 1
        unit_of_measurement: μR/h

gistfile2.txt

#include "esphome.h"
#include "CG_RadSens.h"

using namespace esphome;
class MyRadSens: public PollingComponent {
 public:
  Sensor *IntensityDynamic_Sensor = new Sensor();
  Sensor *IntensityStatic_Sensor = new Sensor();
  CG_RadSens myself{RS_DEFAULT_I2C_ADDRESS};
  MyRadSens(): PollingComponent(5000) {}

  void setup() override {
    myself.init();
    myself.setLedState(true);
    myself.setSensitivity(105);
  }

  void update() override {
    float IntensityDynamic = myself.getRadIntensyDynamic();
    float IntensityStatic = myself.getRadIntensyStatic();
    IntensityDynamic_Sensor->publish_state(IntensityDynamic);
    IntensityStatic_Sensor->publish_state(IntensityStatic);
  }
};