according to your definition of easy. You may import the PST into your account and have the emails synchronized if your Gmail account is already connected to Outlook through IMAP (no contacts, no calendar, no rules). It will sync everything if, by chance, you have Gmail from Google Apps and can sync it in MAP (exchange mail protocol). If you anticipated a method for importing a PST file into a Gmail account using webmail... not yet, and I don't see that happening any time soon. Read more.

1. https://www.shoviv.com/blog/how-to-import-pst-file-into-gmail/