If user adds custom fields like Start / End Date at Initative or Epic, you could probably take that data to show how it is progressing in a timeline Gantt view and show a progress bar against those dates (progress already being tracked).
Ability to select multiple link types to be displayed on the tree view
As a user, I want to customise the link types as part of the hierarchy (along with parent-child relationship) so that I can visualise both parent-child and dependencies between issues in one hierarchical structure.
As a user, I want to enable dark mode (or a dark theme) by switching it as a setting so that it’s easier on the eyes, especially in dark environments. *Suggestion by: Mike Wainwright
Use different issue link types to link different levels of the hierarchy
**As a** user **I want to** be able to specify a different issue link type for each level of my issue hierarchy. For example, to link level 1 and 2 I want to use the “Parent-Child” issue link but to link level 2 and 3 I want to use the “Hierarchy”...
As a user I want to edit the field value directly from the table, so that I can make changes to the issue details without having to open up the view modal.
Ability to display duplicate issues linked to multiple issues in the hierarchy tree
As a user I want to have the option to switch between showing or hiding duplicate issues So that I can better visualize the linking relationship between my Jira issues.