Help with adding additional programs to build new image

I want to build image which will have full python3 standard library, mc (midnight commander) and ncurses. If I understand that correct, that can be done with editing buildroot-2021.05/configs/milkv-duo-sd_musl_riscv64_defconfig by adding:
BR2_PACKAGE_MC=y (for midnight commander)
I dont know what to do for ncurses and full python3 (copilot suggested to add BR2_PACKAGE_PYTHON3_FULL=y), but when I build the image and mount it to see the structure there was no /usr/lib/python3.9 at all and I did not flash sd card with that image.
Also, how to add ncurses and curses for python3?

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