The Google Search Console Performance report API does not include Google Discover data. We’ve known that for a while. But the question is why? John Mueller of Google said the reason is “partially because there’s no notion of “query”.”

In March 2020, John Mueller asked for you, the SEO community, to let him know why you would want Google Discover data in the API. So it is probably something that is on the mind of some Googlers. But March 2020 through now has felt really long, really long ago.

Rob asked about it again:

John explained:

I do wonder if one day they will add this data to the API, I do suspect so?

Forum discussion at Twitter.