https://www.amazon.com/Komitas-articles-musicological-treatises-Vardapet/dp/B0006RY52Q

This book may have some but not many I was also able to find bunch of stuff in Armenian, let me know if you need them or any help with Armenian. Like these

https://grahavak.blogspot.com/2015/11/14.html

The one above has thousands of his compositions.