At the moment, Templates are available at the Project level. One workaround to this could be the creation of a Project exclusively to hold Tasks you set up as individual templates.
Proceed by making a copy of the Task you’re using as a copy. Once you have created a copy of that Task, add it to the relevant Project space by using the Tab+P.
Conversely, what you can do is have those individual Task templates “live” in the Projects where they need to be used. This way when you make a copy, it already lives in the right place. This is important because Project specific custom fields (for example) will stay applied to those Tasks
Hope this helps Bhaskar