Element template service task output parameter

hi.i have problem with service task element template
this is my element template ServiceTask.json (3.3 KB)

and the problem is
out put parameter in service task just have name.–>

.but i want source is editable in service task like this →

mean i expect script in outparameter shown in my template .
sorry if i explaint it bad.

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I’m also interested in knowing if there is any way to let the output parameter expression be customized using templates.