It might be possible. The importer intentionally removes things like style tags as they are often closely associated with your theme and hence are not relavent for your new WordPress theme.
In summary you will need to work out how your center aligned paragraphs have been styled. You will need to update a file to reflect this. Then remove all the freshly imported posts, empty the trash and reset the importer. You can then re-import the posts.
Firstly examing the HTML blogger is using for your styling. Assuming that blogger has done the center styling via a "STYLE" tag.
Open blogger-importer-sanitize.php and on line 16 you will find a long string of things that are stripped. Style is right at the end. Remove this and save the file. If you are working on a local copy, re-upload to your website.
From WordPress dashboard locate your new posts and move to trash.
Goto the trash and empty it.
Return to the Blogger importer and choose the "Clear Account Information".
Reconnect to blogger and re-import your data.
Note if your old blogger theme uses a "class" to style the centre justified paragraphs then you should just be able to add that to your new WordPress theme.