Point data in some few points in an unstructured grid

I have an unstructured grid with 100 points and I have to add data in few points, for instance 10 points. If I create an abstract array with this data and only add data in 10 points, then I have a lot of points with NAN data and I have an error message in Paraview when I open this file.

How could I and point data only in several points?