Filtering: Always show default/Dummy data + show user selected value

Hello, I want to filter a visual ("as Timeline" from Marketplace, if that matters) by two values:

1. Default Dummy rows/data always selected (to display days with no data for the selected name) - user cannot unselect
2. One selected employee name from a chicklet slicer. - user can choose 

I want the visual to always show the dummy data + a selected employee data.

I tried to write a measure to filter by. I had to turn off interactions between the slicer and the visual, but then the measure is not affected by the slicer selected value.

I dont want the user to manually select dummy and a desired value with CTRL click.

Any ideas?

Warm regards,

Jakub Dušek