Accessing WhatsApp iCloud backup?

My whatsapp is occupying 18 GB of my icloud storage.

How can I access this backup and see the contents?

• I've tried searching Google but there are so many spam articles from people offering dodgy apps
• I don't see any data on my Macbook in iCloud Drive
• I do see the WhatsApp data in my Macbook iCloud settings pane, when I click "Manage" in the bottom right corner. This storage screen shows 18Gb of WhatsApp data but only lets me delete the data, not access it.
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• How can I access this data?