JIRA also supports the @user functionality, however - this is useful only in the comments.
For tasks, there should be a field called Assignee which you will be able to choose when creating the task.
The only way to do it while creating the task is to add use the assignee field.
If the task is already created - you can use keyboard shortcuts. select the issue and press 'a' which opens a pop-up that allows you to choose the assignee of the issue.
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