Gantt-Chart ignores Due Date field

Hello,
maybe it is already possible but i could not find it. In gantt-report i want to see my milestones which i have put as a Card into youtrack with the Type: Milestone. The Type has the attribute DueDate. When creating the gantt-report youtrack does igonore this attribute and just puts it at the start.

additionally, how i accomodate the gantt-report so all subtasks are not starting at the beginning but after each other. for some tasks we will have the possibility of 3 parallel tasks, for some we will have only 1 and for some we have 8