Using NULL or empty string in grid filters



We’re using Pimcore 5.x. I try to find a way to do a filtering on column that has empty values. Attribute is Select field:

1 -> First option, 2 -> Second option, etc…

I’m able to filter rows based on options, but I would like to see only the rows where there is no value for this attribute. I’ve tried to use empty string, NULL word - nothing works. It is surprising that I cannot filter rows for null values.

Maybe it is possible?
Maybe I can use Operators? But I was noticed that I’m unable to do filters and sorts on column with operators.
Please, let me know.