ente Authenticator (a secondary product of ente[1]) also allows you to export your codes:

• 1. Click on the hamburger menu
• 2. Data -> Export codes
• 3. Choose if you would like to apply an encryption to the file (recommended) or just let it be plain text (don't do this)
• 4. Enter the desired password and export the file to a custom location

The initial screen of the application may lead you to create an account but you do not need to do that, you can simply click on "Use without backups" when the application first launches to skip that option.

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[1]https://github.com/ente-io