This driver efficiently drives WS2812B (or compatible) LED chips on the RP2040 and integrates into the pico-sdk.
In your CMakeLists.txt add:
add_subdirectory(path/to/zepico_ws2812b)
And link your target to zepico_ws2812b:
target_link_libraries(${TARGET} ... zepico_ws2812b ...)
Have a look at one of the provided examples.