Platformio.ini for Atmega on abreadboard 8Mhz Internal clock

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I made a barebone atmega328P board with 8Mhz internal clock bootloader…
I choose Atmega on a breadboard 8Mhz Internal clock with Arduino IDE.
When I start Platformio I cannot find project for my board in a new project.
Which board is working for my breadboard 8Mhz Internal clock. Otherwise, please suggest me platformio.ini to try.

Somsak

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