STM32WLxx series chips should be supported by the stm32cube framework through a framework-stm32cubewl package. However, this doesn't exist yet and the board JSONs are also not marked to have support for it.

It can be manually added per https://community.platformio.org/t/how-to-use-stm32wl55jc-under-stm32cube-framework/32926, but we need official support.