Hi Ivan,
Whatever solution you choose, always make sure you back up the original copy of the results file. I don’t think there’s a clear preferred solution here, but if it were me, I would probably directly edit a copy of the file and look for the regular expression pattern (,fillers,.+)(,[A-Z]\d+){2} and then replace all occurrences with first match + second match ($1$2 in Visual Studio Code)
Jeremy