PowerBI Server - bypassing the Semantic layer / Live Connection

Hello,

We started to use the cloud PowerBI Service to connect to our on-prem based data (Postgres) via the Gateway.

However, the problem is that the semantic layer doesn't work well with Postgres and moreover, we actually would like to bypass the Semantic layer and connect to the data natively.

Is it even possible using the cloud PowerBI service or the on-prem-based Reporting Server? I couldn't find any place where I can create a Live connection (not DirectQuery).

Thank you!