You will find another example in the 'Examples/Scripts' folder of Mnova. You will see below a script to show multiplet labels with the number of Hydrogens. You can also add new labels by using the scripting feature. It will be also possible to modify the information of the multiplet label, just by selecting the desired option in the drop down menu: Once there, you can choose the color, the font and the margin of the 'Multiplet' boxes. Double click on the spectrum display and select Properties/Multiplets to display the 'Multiplets Properties' dialog box
It is really easy to customize the multiplet boxes.