How to locate some const data at absolute address with PIO and ESP32

Is it possible to locate const data at a fixed offset in the program.bin file ?
e.g. some attribute setting like at(x), which I tried and is not recognized.

I want to be able put small a descriptive structure at a fixed offset in my program.bin file. The intention being to check the content of the structure during an OTA update to check that program being loaded is of the correct type.