Importing legacy items with closed dates

[gary palangian]

I'm importing some legacy data from an old excel-based tracking system into JIRA.  I've got the process for importing a CSV file figured out, but I am having difficulty figuring out how to import the "concept" of the date when the legacy issue closed.

For context, please refer to the attached snap of the built-in Cumulative Flow Diagram report from JIRA 7.6.10 and notice the pop-up detailing VCE-21 "In Progress >> Done" transition on 25/JUL/19.  VCE-21 was created and closed in JIRA.

My objective is to import my legacy issues so that they're accurate with respect to this report; said another way, I want to import my legacy items so JIRA 'understands' when the item changed to done.

Possible?