Is there any way to use fillnull conditionally

I have a requirement, where i need to switch the fillnull value between Excluded and N/A. So is there any way that i can use fillnull conditionally. Eg: if (status == "EXCLUDED") then fillnull value="EXCLUDED" OR if (status == "N/A") then fillnull value="N/A" Is this can be done ? Please help me on this, i really need this kind of behavior in my dashboard.