Filter with exists and value: null

I am trying to make a filter in Lens
field: exists does not take in count fields that have value null

ie. I am trying to only check for the key
How can I achieve this?

I think that's pretty much how fields work in Elasticsearch, based on this issue: Exists filter on scripted fields not working · Issue #61599 · elastic/kibana · GitHub
Feel free to open another issue, since this wouldn't be covered by the one above, but I see it as a pretty big/risky change so I wouldn't hold my hopes up for a very quick fix.

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ok thanks. I look for work arounds

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