The FlashStorage_STM32 library aims to provide a convenient way to store and retrieve user's data using the non-volatile flash memory of STM32F/L/H/G/WB/MP1. It's using the buffered read and write to minimize the access to Flash. It now supports writing and reading the whole object, not just byte-and-byte. New STM32 core v2.0.0 is also supported…

The FlashStorage_SAMD library provides a convenient way to store and retrieve user's data using the non-volatile flash memory

Probably the best way to add emulated EEPROM to your Arduino project

"Emulated EEPROM for STM32: A lightweight library that emulates EEPROM functionality using STM32’s internal flash memory, providing simple read and write operations for integer and string data, ensuring data persistence even after power cycles."