Mac OLM to Gmail account

You can safely import Mac OLM to Gmail account directly using third-party software like Mac OLM to Gmail Migrator. During conversion the software saved different file formats like PST, EML, MSG, MBOX, EMLX, HTML, MHTML, VCF, Office365, and Gmail with attachments. I recommend you to first try its free demo version and analyze all features and working of this software.