How to get pages and visuals lists via REST API

Dear community,

I'm trying to embed my visual into Microsoft sample application https://microsoft.github.io/PowerBI-JavaScript/demo/v2-demo/index.html# .

But it requires Page Name and Visual Name. I thought I can get both via API, but which I can't retrieve it because there are no relevant methods https://docs.microsoft.com/en-us/rest/api/power-bi/. Maybe somebody has a workaround for that? 

Regards,
Ruslan