Project milestone in the high-level board

Hi,
I have created a high-level dashboard connected to the low-level dashboards of various projects. The projects have three milestones. These are managed as items within the individual projects. Management would like to see these milestones on the high-level board. I would like the milestone updates to be dynamic, at least in one direction (changing the milestone in the project also changes it on the high-level board). Is this possible?

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