How to get null values in custom dashboard

Hi team, we are building a custom dashboard and in filter we want to add a condition where to only show the result when a session tag is null or empty.

If you see in the below screenshot, we get two values in the last column which are true and empty.

Screenshot 2024-05-14 at 10.51.57 PM

We only want to keep the ones which are empty or not true.

We tried using a filter which is not in true but it removes the empty or null values also and gives us no result.

Is there any way to make this work?