[TxMt] Change (adapt) syntax-highlighting

Hi, what is the best form, to change/adapt the highlighting of ons own often-used functions?

E.g. if I have a Perl sub called `i` (printing some debug-info to stdout) and to be used e.g.

i 'Starting ifgrp store ...';

And if would like to have these lines formatted like a comment (grey, italics) so that it survives changes in the Perl-Bundle including reinstallations of TM2. Where and how would someone define that?

My guess is, to place it in my own Bundle and to use something like

begin = '^\s*'; end = ';\s*$'; # trailing white space may occure

But I can't figure out the details.

Thanks and kind regards, Ingo