ESP32 flash encryption

[verus2281]

Hi, I'm trying to make a flash encryption for my DIY ELRS board. ELRS is based on platformio and arduino framework, code is very complex so I can't import it to Espressif IDE and use ESP-IDF framework (if I could use esp-idf then enabling encryption would be very easy). Does anybody knows how to enable flash encryption without ESP-IDF? I not found any way how to do that without ESP-IDF