You could import everything into just title (including the year)
then copy all of TITLE into YEAR,
leave only the 4 digits in YEAR
remove the 4 digits and the brackets in TITLE
many more steps than just use the converter filename-tag
and then the converter tag-tag with
Format string: %title%)
The problem with the original filename is that the separator in one case can be omitted while in the other case should be included in the data.