Cardinality, adding missing documents to a different bucket

Hello everyone. I'm beginner with little experience and currently trying to gain experience with experiments. I have a problem with cardinality aggregation.
When cardinality is used, it ignores docs with missing values but if you use "missing":"N/A" line it treats them as if they have a value and puts all to the same bucket.
So my question is can i create a separate bucket to put docs that have a missing value? The reason why I am doing this is to separate the docs and finding docs with missing values. I'm trying to create a watcher to notify me when docs missing values.

I don't know if I put my thoughts correctly but any help is welcomed. Thanks in advance.

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