You can’t repeat the same field key in yaml.
You can’t create “groups” in yaml (neither in inline fields).
In inline fields you can do this:
Name:: Jack
blabla...
Name:: Jill
but the result is an array similar to this in yaml:
Name:
- Jack
- Jill
Each field is an array (multiple values) without direct relation with values in other fields.
Name:
- Jack
- Jill
Born:
- 1854-07-24
- 1955-07-27
No direct relation with Jack
and 1854-07-24
(only the first in the list).