How to Calculate Duration between Dates in Dataview

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).