Using user data for filtering

Hi everyone,

I am rather new to PowerBi.

Here is my use case: I have an Excel spreadsheet with different tabs as data source.

The data contain activities on sales opportunities - one field is "assigned to".

I would like to make dashboards/reports available to individuals that I filter on a report level against the "against to" field based on the user login.

While I have seen forum threads on SSAS and security using online sources, I lack anything on "offline" data sources.

Is there any way to access the user data (eg. login name) inside PowerBI and use this for filtering?

Thanks,

     Holger