How to setup Platform IO for Atmega8 & Atmega16 Generic AVR programming

Hi there,
i am a newbie to Platform IO world ,
can you please guide me who to setup Atmega8 & Atmega16 micro controllers with Generic AVR base programming framework.
I can only find Arduino as a framework here in Platform IO. I would like to Avoid using Arduino based setup.

Thanks
Shub

Clone platform-atmelavr/examples/assembly-blink at develop · platformio/platform-atmelavr · GitHub or platform-atmelavr/examples/native-blink at develop · platformio/platform-atmelavr · GitHub + change board.