That's the way how it has been designed, see the topic of this thread.
'Beluna', you should open a new topic, because your theme points into some other direction than the OP's thread theme, I think so.
If you need particular help on an existing Mp3tag export script, which you have modified by yourself to fit your needs, in order to create a HTML script to fit your needs, then post your script and someone may step in and may help.
Please study the export scripts in the Mp3tag forum area 'Export Configuration Archive' ...
Export Configuration Archive
... and all the other numerous posted export scripts from Mp3tag users.
The HTML tag for a linebreak is
and it can be inserted into a Mp3tag export script like this ...
'
You can look into the script there ...
Spalten automatisch erzeugen
... how to apply a HTML linebreak.
DD.20110716.0800.CEST