Is it possible to use my own steplib?

Is is possible to use my own steplib instead of bitrise’s steplib?

I tried to change default_step_lib_source but it doesn’t work.
I also tried use this format: StepLibSource::StepID@StepVersion:

My steplib repository is public and I can run my steps directly using - git::MY_STEP_REPO:NAME@VERSION

My custom steplib works on my local machine.