Is it possible to remove a field from a document

[DanielLeberle]

I'm using Ballcap in a SwiftUI environment and I have a class that contains an optional field of type DocumentReference in its Model.
Initially the field does not exist but I can set it through the UI of my app. This works just as expected.
But I would like to be able to also remove the reference. I tried setting it to nil but this doesn't work unfortunately.

Is there currently any way to achieve this with Ballcap?

Thanks for your help!