may be some one find it usefull. Template project and HOW TO how to use Heltec esp32 (with LoRa and OLED) SDK as a esp-idf component under Eclipse Oxygen IDE (Windows 10).
https://github.com/imelekhin/heltec_eclipse_esp-idf
at least OLED UI example compiles and runs. With mix of some native esp-idf calls.
P.S>
Experience with Eclipse after Arduino IDE is amazing
))