[Paraview] naming Zones in VTK

[p.p pyloth]

Is it possible to name  surace zones in VTK ascii file  that can be latter opened at paraview

Just like inlet surface zone , wall surface zone etc

My problem flow past a sphere(hollow)   I want to Chane the color of these sphere surface inside the flow field .  Is it possible

Also is it possible to find the pressure drag using para-view?
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