To be honest, I am not really clear on what you mean by the segment builder operator menu or where you'd include the is null and is not null options. Can you please elaborate a bit more on what you're trying to do? Where would you want to use these options? Are you referring to the Segment UI settings when you mentioned the Segment builder operator menu? Was this something that you were using before and then it was removed in the UI? Do you have any docs that explain what you're looking to do? I would love to help clear this out as long as I can get your help with more details on what your needs are
Looking forward to hearing back from you!
Thank you