To create report with list of defects and no. of test cases blocked with respective defects

We need to build an automated dashboard showing, for each Jira defect, the number of Zephyr Scale test cases it blocks. When defects are linked from the Test Player, the browser's internal endpoint /backend/rest/tests/2.0/testrun/{id}/testresults returns traceLinks, but the public endpoint /v2/testexecutions/{id}/links returns an empty issues array. Which official REST API should we use to retrieve these linked defects?