YJ, how about this:
X = '0.0000012345';
Y = '0.0987654321';
strValues = sprintf('(%4.1e,%4.1e)',str2num(X),str2num(Y));
text(0.1,0.1,strValues,'HorizontalAlignment','left');
Simply, copy-paste-execute to see if this would do the trick. Check out the documentation for the sprintf command for formatting guidelines.
