Link dashboard cross-filters to main filter widget

We have a dashboard with some custom filters in the main filter pane on the lefthand (by default) side. We also have some tabs in the dashboard that contain charts/tables with cross-filtering, so users can drill down on specific dimensions. But there is some overlap -- there are some charts that have cross-filter dimensions that are also available as manual filters.

Request: add a way to automatically populate the filter dropdown fields on the left from dashboard cross-filter events emmitted from individual charts (where applicable).