[YAML] resolve variables in inlined YAML

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #11665
| License       | MIT
| Doc PR        | 

#11569 does not resolve variables in inline YAML.
instead of putting comments to describe the dataset, you should use the keys in the main array to name your datasets (this way, it also appears in failure messages rather than getting a numeric index)