API: Get a page URL from the itemId

Hi, I'm looking to do exactly what is described here: https://experienceleaguecommunities.adobe.com/t5/adobe-analytics-questions/adobe-analytics-2-0-api/qaq-p/326794: Fetch metrics by page URL.
I've found out that the dimension to use is 'variables/page', but as the pages are named in my demo data, I get the name in the objects of the response: "itemId": "0123456789", "value": "page name", "data": [ 1234 ]

Now, how can we associate the itemId with an actual URL? The linked post mention to make a separate breakdown call, but I can't find the concrete endpoint to do that in the API.

Thanks!