About the support for "stm32l011f4"

Does “platformIO” support the “STM32L011F4” chip?

The K4 version is supported but not the F4 version.

I also don’t see e.g. Arduino support for that chip.

As always, custom support can be added by adding a custom board definition and Arduino variant implementation, as e.g. seen in here.

For official support, open issues in GitHub - platformio/platform-ststm32: ST STM32: development platform for PlatformIO and Issues · stm32duino/Arduino_Core_STM32 · GitHub.