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be/app/Http/Resources/SubTaskResource.php

@@ -29,6 +29,7 @@ class SubTaskResource extends JsonResource
             'duration' => $this->estimated_time,
             'spent_time' => $this->tracked_time,
             'deadline' => $this->deadline,
+            'master_task_deadline' => $this->mastertask->deadline,
             'is_finished' => $this->is_finished,
             'timeblocks' => TimeblockResource::collection($this->timeblocks),
             'timesheets' => TimesheetResource::collection($this->timesheets),