import wordpress users via csv including membership type and date

I hope someone can help me or give me some advice.
I am creating a membership website and am using the Membership plugin.
I have a list of current members that I need to import. I have been using import user by csv ( I am struggling with the following:

-current members have a membership number, i would like to use the user id in wordpress as the membership number. Can I import the members and assign them he relevant user id

-I would also like to import their membership subscription and expiry date, what are these field IDs for including in the csv file?

your help would be greatly appreciated.

Many thanks