Hi Paolo,
Yes - in both Notation Musician and Notation Composer (see the website at
www.notation.com) you can use the Arpeggio ornament to change the performance of "block" chords to sound strummed.
You can find that feature in the Notes palette, Ornaments button, Upward Arpeggio button (there is also a Downward Arpeggio).
Enjoy
Sherry