Importing post etc including expiry dates

I would also like to know how to do this. Specifically I’m importing custom posts via a CSV file, but I cannot see a field to import the expiration date into. The only meta field associated with Post Expirator seems to be _expiration-date-status which seems to be set as NULL when I checked a custom post which had the expirator set on.
A bit of explanation about where the plugin holds the expiration date data and how to added it to imported posts would be very useful.

Thanks!