Note: Feature requests are judged based on user experience and modelled on Go Experience Reports. These reports should focus on the problems: they should not focus on and need not propose solutions.
It would be great to prioritize support for facets in GraphQL, we're increasingly seeing our community interested in the feature.
Here is an open conversation in our community channel with this feature request:

Facets are on our backlog to consider for upcoming GraphQL features.
Github issues have been deprecated.
This issue has been moved to discuss. You can follow the conversation there and also subscribe to updates by changing your notification preferences.

Most helpful comment
Facets are on our backlog to consider for upcoming GraphQL features.