Require approval from a code owner - need help with config

Hi all,
I want to know please if is there any option (and how to config it) to:

  1. require approval from code owner groups and not the specific owners.
  2. Is it possible to apply for code owner approval permissions at the root directory level instead of to config each repository, please?
    Would appreciate getting a reference/step-by-step instructions.
    Thanks a lot,
    Ronen