How to remove Private Metafield from a client's store after uninstalling an app?

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Our client has reported encountering difficulties after uninstalling our app, Webrex Announcement Bar. Despite the uninstallation, remnants of our code are persisting in their store. After a thorough investigation, we have identified a specific issue with the Private Metafield.

Merchant shop URL - https://wolph.co.uk/

To resolve this, we kindly request that you remove the Private Metafield associated with our app from the client's Shopify store. This will ensure a clean and seamless experience for them.

Merchant current theme -