If you are looking for another option for importing EML files into Google Workspace, I would also consider
BitRecover EML to G Suite Migration Tool .
It supports bulk migration, so you can process multiple EML files or folders instead of uploading messages individually. You can select specific folders and subfolders, while preserving the email content, attachments, formatting, headers, and folder hierarchy during the transfer.
One useful feature for larger migrations is the ability to apply filters such as date range, sender, recipient, and subject, which helps avoid moving unnecessary emails. It also supports incremental migration, so newer emails can be transferred later without repeating the entire migration.
For administrators, the tool supports multiple-account migration, making it more practical when EML archives from several users need to be moved into Google Workspace.
I would still test a small EML folder first and verify attachments, labels/folders, dates, and message formatting in the destination before starting the complete migration.