Import data into Sprout SEO
The problem you're running into is that FeedMe doesn't know how to import into custom element types; I think a special hook would need to be written.

If you use my SEOmatic plugin it has a FieldType that lets you choose what fields to pull things like the title, description, etc. from which solves this problem.

Check out the section of the wiki docs on SEO Entry Meta to see how that all works.