course_started_on learndash

Hello, I used your plugin to transfer the rate of progress of the users in the course in Larandesh. But I was not able to update the start date as in the original website.
After checking, I made progress reports of course users, I saw that the new website lacks a column called “course_started_on” where it can be found in your plugin? Within WP Users I didn’t find it. And this is critical for transferring their data on the site.