The IoT-devices team developed, tested and made available on GitHub a ready-to-use GGreg20_V3 driver for ESP32 with Tasmota firmware and Berry scripting language.

The driver allows you to receive pulses from the ionizing radiation detection module GGreg20_V3, accumulate them and calculate the radiation power (uSv / h), radiation dose (uSV) and moving average (MA5) radiation power (uSV / H) within a five-minute buffer.

You can find this driver at the following link:
https://github.com/iotdevicesdev/ggreg20-v3-tasmota-esp32-driver