How to make a loop of artist within file from ARTIST field to ALBUMARTISTSORT field

For such a task there is no other way within Mp3tag as to export data, modify data within the export script, and later import the resulting data into the tag within the audio file by applying "Convert Textfile to Tag".

Please study and apply this proposal ...
Listing all Artists from Album into One Tag Field
... and try out the other offered export scripts too.

DD.20160226.1147.CET