How to add EXTRA_CONF_FILE in CMakeLists.txt

Hello

I want to add an extra config file based on the option in prj.conf or in Kconfg.

For example:

CONFIG_WIFI_SCAN_ONLY=y

include the overlay-nrf7000-wifi-scan-only.conf file

How to do that?

I have chek here https://docs.nordicsemi.com/bundle/ncs-latest/page/zephyr/develop/application/index.html#important_build_system_variables and test the next code in CMakeLists.txt but it doesn't work.

# Include the WiFi scan only overlay
if(CONFIG_WIFI_SCAN_ONLY)
    set(EXTRA_CONF_FILE "overlay-nrf7000-wifi-scan-only.conf")
endif()