Connect to dataflow in Power BI Service?

unfortunately not. You gotta create a semantic model first, which commonly done in Power bi desktop. But you do have the option to create a semantic model in power bi service through either pbi datamart or lakehouse

Hi mopetkewi 

Yes, you can connect to a dataflow directly from a report in the Power BI service using DirectQuery. This allows you to connect to a dataflow without needing to import the data into Power BI Desktop.

Follow below steps to Connect to a Dataflow Using DirectQuery
Enable Enhanced Compute Engine:
- Ensure the enhanced compute engine is enabled for your dataflow. This setting is necessary for DirectQuery to work.
- Go to the dataflow settings in the Power BI service, toggle the enhanced compute engine to “On,” and refresh the dataflow.

Create a Report in Power BI Service:
- In the Power BI service, navigate to the workspace where your dataflow is located.
- Click on Create > Report.

Select Data Source:
- Choose Dataflows as your data source.
- Select the dataflow you want to connect to. You will be prompted to choose between DirectQuery and Import. Select DirectQuery.

Build Your Report:
- Once connected, you can start building your report using the data from the dataflow. The data will be queried in real-time, providing up-to-date information without the need for manual refreshes

Need additinal info visit this - https://learn.microsoft.com/en-us/power-bi/transform-model/dataflows/dataflows-directquery

Thanks