Getting pullrequests via REST API

I have an issue in YT, in VSC changes tab I can see two separate items:
* %username% Committed changes %date%    %commit hash and link to github%

* %username% Submitted a pull request %date%     %PR id and link to github%

I can get the first item, via api/issues/${issueId}/vcsChanges

But I can't find any docs or API or anything to get the second item (linked PRs).

Only in workflows I see the docs for prs and vcs changes.

Is there a way to get linked PRs via rest api?