obtain the sum of task hours in the epic

[Deleted user]

I am using Jira server which will soon become Jira datacenter. I have Tempo Timesheets as a good plugin for reporting the hours worked on issues. But I still can't get an overall sum of the hours worked. When I look at an epic, if the epic has sub-tasks, then the time of the sub-tasks adds up to the time of the epic. so if I set an estimation of the initial hours, I can see how many I am consuming as I work. But the tasks linked to the epic do not report the hours. So I ask you, how do you do it? Is it possible, without buying other plugins, maybe using automation for Jira or something, to make it so that when I look at an epic, I also see in the epic report the hours of the underlying tasks? Thanks in advance.