The Sprint Retrospectives are a good way for teams to track continuous improvement items. Using the conduct feature makes it easy to add Stories and Issues to retrospectives. On the backlog grid, you can add the sprint retrospective field and view them together. The Retrospective field is not available on the Issues Grids and that makes it impossible to limit views of Issues to this created by a Team in a retrospective.

The ability filter by Sprint retrospective object would be a nice to have. For now, being able to display the Retrospective in the Issues grid would allow for a sort of the grid to show all those with a Retrospective at the top.