Quick quote the start and due of project

[breestealth]

In some case, I need to use the start and due of the project in the sub tasks.
For example, I want to set due of one of the sub tasks to 2 days after the start of the project.
Although I could use dataVariable to fit my requirement, I hope there could be the quick quote of the start and due of the project. For example, I could use ProjectDue as the due of the project in anywhere of the template.