Group notification when new task was added to the group

Group notification when new task was added to the group

Hello
In the Notification Rules we have an ability to notify a group of the technicians when a request was added and assign to the group. 
Same, when a request is left unpicked in a group.
But we dont have same function for a tasks. It's very needed for us.
How can i notify (automatically) a group of the technicians when a new task was assigned to a group?

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