Yes, you can import Tasks and Issues through the data importer.
To import Tasks, select 'Tasks' in the 'Choose the App' dropdown.
To import Issues, select 'Issues' in the 'Choose the App' dropdown.
You will need to have our Intelligent Team Automation (Tasks and Issues) feature set enabled to use this workflow! If you do not see Tasks and Issues in Fulcrum, please reach out to our support team via the little red chat bubble in the bottom right and ask them to enable it. It is included with your existing subscription.