Enumerates keyword plan annotations that can be requested.

[Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v26/enums/keyword_plan_keyword_annotation.proto)

| Enums ||
|---|---|
| ## `KEYWORD_CONCEPT` | Return the keyword concept and concept group data. |
| ## `UNKNOWN` | The value is unknown in this version. |
| ## `UNSPECIFIED` | Not specified. |