Manually Create PolyData in vtk.js

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What about setting scalar for cell data.

In python, it is

polydata.GetCellData().SetScalars(valuesArray)

I cannot do the same thing with vtk.js

polydata.getCellData().getScalars().setData(Float32Array.from(valuesArray));

gives me
TypeError: polydata.getCellData(...).getScalars(...) is null