Welcome to the Wefugees Community and thanks for your question!
I assume that you are referring to and interested in the so-called Beschäftigungsduldung, which will be introduced in January 2020?
If I am right, please check Melina’s answer in this thread, which explains in details, which (unfortunately very high) requirements will apply.
Otherwise, please feel free to get back to us for clarification or further questions.
All the best,