JIra Advanced Roadmap Rest API


I wanted to ask if there is a possibility to retrieve Advanced Roadmap Hierarchy information using Rest API within a connect app.

I was able to identify the following endpoint: /rest/jpo/1.0/info/query
is used by Jira but I could not find any documentation and when I tried to use it inside plugin I got 403 (caused by ap-client-key header) so I assume apps can’t access this resource.

Is there currently any way to retrieve this data?