You can use the Retrieve Campaign Summary API call to retrieve a lot of information about a campaign. You could easily use it to build a thermometer. It cannot retrieve the number of donors (people), but it can retrieve the number of donations (transactions).
The campaign progress widgets (aka thermometers) found within NeonCRM are generally configurable only to the extent shown in the user interface. If you want more than that, you can use the API to build your own.