‘Feature Link’ to appear as a drop down with the list of features created within the selected EPIC

When you edit an issue, there is an EPIC link inside the ‘story’ or ‘feature’ as a drop down.

This drop down has the EPICs that are part of the project. Similarly, I would like to have the ‘Feature Link’ inside the story to appear as a drop down with the list of features created within the selected EPIC.