I have one but it is kind of a pain. I create the task list and dates in Excel. Then I use a product called Import2 to import the tasks into HubSpot. It does work and if the spreadsheet is created correctly, it will assign tasks to the appropriate users and add them to the task lists.
Find Import2 info at https://www.import2.com/.
This feature is needed even more now than it was when I created this orig post.