When Memento activates an alarm, it displays a popup whose text is taken from the field used as "Name" in the list of items.
It would be very useful to be able to customize the popup text, for example using a special javascript field that programmatically builds the text to be shown in the popup.
In my opinion there are two ways to implement this functionality:
1) in the "Edit library" tab => in the "main" tab, you can indicate, in addition to which field to use as a name, as a description, as an element preview, as an element color and as a background color, also which field to use for the popup of the Wake Up;
2) in the "Edit library" tab => in the "Edit field" tab for javascript fields => in the "Show in list as" drop-down list you can add the "Alarm pop-up" option.