Git - Git flow assistance

Hello Git !

I'm Git fan, I'm using it currently in my job. Git is awesome, I really like it.

I have an issue with git flow command and need some help please My problem is: In my team we create branch names with a pattern:

developer_identity/feature_or_bug /task_number-brief-description

Now when I'm using the command it asks me to enter feature branches prefix with a suggestion "feature/", is there a way to use variables in the name of branch? 

for example, a prefix like this one:

developer_unique_id/

=> We need to make a global variable as prefix in the branch name. 

If this isn't possible, is there another way to do something similar? 

Thanks in advance.

Kind regards.