Non volatile data in nano rp2040 connect

I am trying to save a few bytes of data in the flashmemory on a nano rp2040 connect board. Every example i tried to use gives the errormessage that eeprom.h cant be found. Eeprom.h is supposed to be included by default, but I cant find it among libraries to install it. I have tried to find the library on internet to download it but without success. Anybody who managed to store data in this way on a nano rp2040 connect, who can help me?

can you send the code you are using in code tags please?

Which core package are you using? As far as I know, the Mbed core doesn't have an EEPROM.h library, while the core of Earle Philhower has.