How to make a selection based on two visualizations in a report?

Let's say, we have three visualizations in a report: (see picture below)
1. Position
2. Segment
3. Customers

First I select a Position
Then under Segment, highlighted are only those that are relevant to that particular selected position

(from a total of 5 customers for this Segment, the selection contains 4 customers)
Now I want to be able to only select the highlighted part of the Segment (SELECTION 2), so only 4 Customers will be displayed
How do I get this done?

The issue that I have is, that I cannot only select the highlighted part (under Segment)

I always have to select one whole Segment, so it will display always the 5 Customers