Fetching resolved pull request reviews

As we know, in pull requests you can open conversation threads to discuss specific portions of code. If a particular conversation is solved it can be marked as resolved.

Example of resolved conversations
Example of non-resolved conversations

(note the “Show resolved” text or lack thereof to the right of each conversation)

I’m trying to fetch this data using the REST API and have not seen it anywhere in the reference, is this simply a limitation of the API?

Thanks