App data metafields in checkout UI Extension

I’ve create metafield that has ownerId of currentAppInstallationId. But i’m not able to access these metafields in checkout UI Extension despite being declared in extension’s toml file.

I’ve created metafields as shown in following image

As mentioned in checkout ui extension docs, Metafields on an app reserved namespace cannot be accessed by Checkout UI extensions.

My main question is, does the mutation shown in image creates app owned metafields or it is different?

It seems that using app-data metafield in checkout ui extension isn’t supported yet.
AppInstallation resource metafield type doesn’t exist the document…

I want to know why app-data metafield can’t be used in checkout ui extension too.

Any official statement ??

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