Subtasks' dependency should also be linked to the main items in the board and not just subtasks

Something i’d really like to see is as the title says, a way to link subtasks’ dependencies to main items. Right now all I can link it to is to other subtasks based on date. Most of my workflow is automated and all depends on a single day that I create. That being said, it doesn’t make sense that I can’t link the subitems to it as well. As of right now, i’m just putting no date on it. If anybody knows a workaround, would love to know.