Escape comma in String Format

I'm doing a tag import using a CSV file and the following string format: %artist%,%title%,%album%,%year%,%genre%

How do I modify the import string so a comma inside %artist% doesn't break the import?

Enclose a field with " like
BUT: the same separators have to be found in the data source:
"Dave Dee, Dozy, Beaky, Mick & Tich",Fresh Ear

Read there ...
"Fields containing a line-break, double-quote or commas should be quoted. (If they are not, the file will likely be impossible to process correctly)."
Example from there ...
1997,Ford,E350,"Super, luxurious truck"

Therefore you have to modify the content within the input file too ...
and take care to adapt the modification into the formatstring within the dialog "Text file - Tag".