How to delete a field into the fieldManager

I’m writing this piece of code :

What I’m thinking is that the widgets are properly deleted, but the fields are still there, because I see there are still the same items in the fieldManager.

What I would like to do would be to delete the widgets, but also to delete the items in the field manager.
How to clear the fieldManager ?

Thanks in advance,
Best Regards,

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Hey there,

We do not currently have any APIs to delete fields and we do not support this use case.

Can I ask why you need to delete the fields in the first place? Just deleting the Widgets should be enough to remove the element from the document.