GRANNT Chart: A Grantt chart is a type of bar chart that illustrates a project schedule. Grantt charts illustrate the start and finish dates of the terminal elements and summary elements of a project, such that completion of the project qualifies the team for a research and development grant.

Serious answer: Issues are not--to my knowledge--a software estimation tool. I have worked for decades in estimation-oriented development environments, and in my (anecdotal) experience, it is a mistake to use the same tool for both estimation and delivery.

It is seductive for them to be the same thing, as you can feed actual times back into your project, but the conclusion I've drawn is that the estimate reflects a kind of "interface" visible to the outside world, while the issues reflect an "implementation" visible to the team.

When they are the same thing, you end up doing a lot of work fiddling with the estimate to keep it congruent with the internal tasks, even when that congruence is not relevant to the delivery date(s).

I realize that this is heterodoxy.