Documentation on the Loki *datasource* API? The one used for querying through Grafana datasource querying API

I’ve found documentation on querying Grafana datasources:

And I’ve found documentation on the Loki API:

But it only describes the API of Loki itself, not “how to query it via Grafana” - and the format seems to be vastly different from both Loki API and other types of datasources.

Is there documentation about querying a Loki datasource via Grafana datasource querying API? I’ve figured out little bits via reverse engineering and extremely scarce Google results, but I still have a lot of questions. For example, the logs I’m getting are unordered but paginated, and I don’t know how to request the next page, or to get them ordered by time.