ssas actions

Sam, I looked at the drillthrough page at https://docs.microsoft.com/en-us/power-bi/desktop-drillthrough

But I still don't understand whether it is connecting to SSAS to get the drillthrough data or is it connecting to the database engine.

I am hoping to build a solution using Power BI as frontend and connected to SSAS cube database on the backend.
Will this drill through page on Power BI use something similar to SSAS drilthrough action on the frontend, instead of just exposing the SSAS drillthrough action?

Thanks for your response.