dashboard and page filter

There a few problems with just pinning the individual objects to the dashboard:

1. The objects lost the interaction rules, for example, when I click on a sub-dept chart, the pie chart will show only the customers relevant to this sub-dept in my report, but the individual objects in the dashboard are "dead", they dont interact

2.  I have a few slicers in the report and I would like to bring over to the dashboard, for example, the sub-dept slicer, the period slicer, etc, so that the dashboard users have richer experience in interacting with the charts.  Pinning individual objects cannot bring over the slicer and the slicer interactions

It is ashamed that the dashboard does not carry over the page filter conditions.  The only solution seems to be:

1. Use Power Query to restrict the data to each department and create for each department a separate pbix file

2. Publish each file to the PowerBI service and now you have for each department 1 report

3. Then pin the report page to dashboard, because each report only contain data of 1 department, it works around the problem of not having a page filter

The problem with this approach is when I have N departments, I have to split N pbix files.  Once the master report template changes, it is painful to repeat the file split.

Hopefully someone can provide a better workaround of using only 1 report file.