I think it can't be done...
The other program I use to get measurements exports a csv file which looks like this:
Filename and path;Actual bitrate;Frequency;Silence in seconds;Clipping %;Max. clipping;
C:\Users\***\Desktop\New folder\01 - Afta Ta Heria.mp3;320;20024;0,00;0,00;2;
C:\Users\***\Desktop\New folder\01 - Allos Gia Hio Travixe (Live).mp3;320;20024;0,33;;0;
C:\Users\***\Desktop\New folder\01 - An Ine I Agapi Amartia (Live).mp3;320;20024;0,00;;0;
C:\Users\***\Desktop\New folder\01 - An Ise Plai Mou (1).mp3;320;20045;0,98;;0;
C:\Users\***\Desktop\New folder\01 - An Ise Plai Mou.mp3;320;20045;0,98;;0;
C:\Users\***\Desktop\New folder\01 - Anepidoto (1).mp3;320;20089;0,00;;0;
C:\Users\***\Desktop\New folder\01 - Anepidoto.mp3;320;20110;0,00;0,00;1;
C:\Users\***\Desktop\New folder\01 - Avgi Anthismeni.mp3;320;20045;0,00;0,00;3;
C:\Users\***\Desktop\New folder\01 - Avrio Pali (1).mp3;320;20024;0,37;0,00;1;
C:\Users\***\Desktop\New folder\01 - Avrio Pali.mp3;320;20024;0,37;0,00;1;
From Mp3tag, after I load the tracks, I go to Conver > Text file - Tag, I put the exported csv file into Filename field and I put %comment% into Format string field. And it imports the data to comment tag line by line. But it isn't assign the values accordingly as you said...
What am I doing wrong?