Have you actually tried installing PyLance in VS Codium? I have not and also do not know if it works. But PyLance is available in https://open-vsx.org/extension

Have you actually tried installing PyLance in VS Codium? I have not and also do not know if it works. But PyLance is available in https://open-vsx.org/extension/ms-python/python https://open-vsx.org/extension/ms-python/python and it seems there are no license issues.